模拟卷4答案
2023届高考英语模拟试卷四(含参考答案)
2023届高考英语模拟试卷四（含参考答案）第I卷（选择题共115分）第一部分听力（共两节，满分30分）第一节（共5小题；每小题1.5分，满分7.5分）听下面5段对话。
每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。
听完每段对话后，你都有l0秒钟的时间来回答有关小题和阅读下一小题。
每段对话仅读一遍。
1. What does the man want to do?A. Take photos.B. Buy a camera.C. Help the woman.2. What are the speakers talking about?A. A noisy night.B. Their life in town.C. A place of living.3. Where is the man now?A. On his way.B. In a restaurant.C. At home4. What will Celia do?A. Find a player.B. Watch a game.C. Play basketball.5. What day is it when the conversation takes place?A. Saturday.B. Sunday.C. Monday.第二节（共15小题；每小题1.5分，满分22.5分）听下面5段对话或独自。
每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。
听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后各小题将给出5秒钟的作答时间。
每段对话或独自读两遍。
听第6段材料，回答第6至7题。
6. What is Sara going to do?A. Buy John a gift.B. Give John a surprise.C. Invite John to France.7. What does the man think of Sara’s plan?A. Funny.B. Exciting.C. Strange.听第7段材料，回答第8至9题。
工程制图与CAD模拟试卷4及答案
模拟试卷4一、单选题1、（）命令用于绘制多条相互平行的线，每一条的颜色和线型可以相同，也可以不同，此命令常用来绘制建筑工程上的墙线：A、直线B、多段线C、多线D、样条曲线2、在一套完整的建筑工程图纸集中应该包括以下类别：建筑平面图、建筑立面图、建筑剖面图和A、建筑结构图B、建筑截面图C、建筑详图D、建筑给排水图3、通常使用三视图来表达建筑构件的实际形态，三视图遵循的投影规律是A、长对正，高相等，宽平齐B、长相等，高平齐，宽对正C、长平齐，高对正，宽相等D、长对正，高平齐，宽相等4、使用publish 命令发布建筑工程图纸到DWF 文件时，如果文件中不包含图层和块的信息，需要在“发布选项…”中的（）里设置A、常规DWF选项B 、DWF 信息选项C、D WF 数据选项D、D WF 文件选项5、建筑平面图中作为轴线的构造线（线型为“ISO dash dot”），无论怎样缩放，都体现不出该对象为点划线，可能造成这种现象的原因是A、构造线不能够设置线型，改为直线即可B、对象的线型只有在图层中设置才有效C、全局线型比例因子太大或太小D、着色模式改为“二维线框”6、在建筑平面图中标注数值?120、± 120时需要输入的字符代码是A、%%u120 ，%%c120B、%%o120 ，%%u120C、%%c120 ，%%p120D、%%d120 ，%%u1207、对建筑图进行标注，当标注线与图线重合时，可以省略的标注内容是A、尺寸线B、尺寸界线C、箭头标记D、尺寸数字8、下列关于标高标注说法错误的是A、标高是标注建筑物高度的一种尺寸标注形式B、标高包括相对标高和绝对标高两种C、建筑物底层地坪高度是相对标高的零点D、标高数字一般保留四位小数9、建筑总平面图中标注的尺寸以( )为单位，一般标注到小数点后( )位；其它建筑图样(平、立、剖面)中所标注的尺寸则以( )为单位；标高都以( )为单位。
A、m、2、cm、mB 、m 、2、mm、mC、cm、3、mm、cmD 、3、m、m10、建筑图上的尺寸单位，除标高及总平面以( )为单位外，其他必须以( )为单位。
2023年普通高等学校招生全国统一考试新高考仿真模拟卷数学(四)(含答案解析)
2023年普通高等学校招生全国统一考试�新高考仿真模拟卷数学（四）学校:___________姓名：___________班级：___________考号：___________一、单选题1．已知复数1z =，则2z 在复平面内对应的点位于（）A ．第一象限B ．第二象限C ．第三象限D ．第四象限2．已知全集{62}U xx =-<<∣，集合{}2230A x x x =+-<∣，则U ðA=（）A ．()6,2-B ．()3,2-C ．()()6,31,2--⋃D ．][()6,31,2--⋃3．陀螺是中国民间最早的娱乐工具之一，也称陀罗.图1是一种木陀螺，可近似地看作是一个圆锥和一个圆柱的组合体，其直观图如图2所示，其中,B C 分别是上､下底面圆的圆心，且36AC AB ==，底面圆的半径为2，则该陀螺的体积是（）A ．803πB ．703p C ．20πD ．563π4．已知一组数据：123,,x x x 的平均数是4，方差是2，则由12331,31,31x x x ---和11这四个数据组成的新数据组的方差是（）A ．27B ．272C ．12D ．115．若非零向量,a b 满足()22,2a b a b a ==-⊥ ，则向量a 与b 夹角的余弦值为（）A ．34B ．12C ．13D ．146．已知圆221:(2)(3)4O x y -+-=，圆222:2270O x y x y +++-=，则同时与圆1O 和圆2O 相切的直线有（）7．已知函数()()sin (0,0,0)f x A x A ωϕωϕπ=+>><<的部分图象如图所示，则函数()f x 在区间[]0,10π上的零点个数为（）A ．6B ．5C ．4D ．38．已知椭圆2222:1(0)x y C a b a b+=>>的左､右焦点分别为12,F F ，点P 在椭圆C 上，若离心率12PF e PF =，则椭圆C 的离心率的取值范围为（）A．()1-B．⎛ ⎝⎭C．2⎫⎪⎪⎣⎭D．)1,1-二、多选题9．若π1tan tan 231tan ααα-⎛⎫-= ⎪+⎝⎭，则α的值可能为（）A ．π36B ．7π36C ．19π36D ．5π36-10．某校10月份举行校运动会，甲､乙､丙三位同学计划从长跑，跳绳，跳远中任选一项参加，每人选择各项目的概率均为13，且每人选择相互独立，则（）A ．三人都选择长跑的概率为127B ．三人都不选择长跑的概率为23C ．至少有两人选择跳绳的概率为427D ．在至少有两人选择跳远的前提下，丙同学选择跳远的概率为5711．设函数()()()1ln 1(0)f x x x x =++>，若()()11f x k x >--恒成立，则满足条件的正整数k 可以是（）A ．1B ．2C ．3D ．412．已知三棱锥-P ABC 中，PA ⊥平面2,4,,3ABC PA BAC AB AC M π∠====是边BC 上一动点，则（）A ．点C 到平面PAB 的距离为2B ．直线AB 与PCC ．若M 是BC 中点，则平面PAM ⊥平面PBCD ．直线PM 与平面ABC三、填空题13．函数()()313xxk f x x k -=∈+⋅R 为奇函数，则实数k 的取值为__________.14．已知抛物线28y x =的焦点为F ，抛物线上一点P ，若5PF =，则POF ∆的面积为______________.15．由数字0,1,2,3,4,5,6,7组成没有重复数字的三位数，则能被5整除的三位数共有__________个.16．已知0a >，函数()22ag x x x+=+-在[)3,+∞上的最小值为2，则实数=a __________.四、解答题17．第24届冬奥会于2022年2月4日在北京市和张家口市联合举行，此项赛事大大激发了国人冰雪运动的热情.某滑雪场在冬奥会期间开业，下表统计了该滑雪场开业第x 天的滑雪人数y （单位：百人）的数据.天数代码x12345滑雪人数y （百人）911142620经过测算，若一天中滑雪人数超过3500人时，当天滑雪场可实现盈利，请建立y 关于x 的回归方程，并预测该滑雪场开业的第几天开始盈利.参考公式：线性回归方程ˆˆˆybx a =+的斜率和截距的最小二乘法估计分别为()()()121ˆˆ,niii ni i x x y y bay bx x x ==--==--∑∑ .18．如图，四边形ABCD 中，150,60,B D AB AD ABC ∠∠====的面积为(1)求AC ；(2)求ACD ∠.19．设数列{}n a 的前n 项和为()*,226n n n S S a n n =+-∈N .(1)求数列{}n a 的通项公式；(2)若数列112n n n a a ++⎧⎫⎨⎩⎭的前m 项和127258m T =，求m 的值.20．如图，正方体1111ABCD A B C D -的棱长为4，点E 、P 分别是1DD 、11A C 的中点.(1)求证：BP ⊥平面11A EC ；(2)求直线1B C 与平面11A EC 所成角的正弦值.21．已知双曲线2222:1(0,0)x y C a b a b-=>>的一条渐近线方程为20x y -=，一个焦点到该渐近线的距离为1.(1)求双曲线C 的方程；(2)若双曲线C 的右顶点为A ，直线:l y kx m =+与双曲线C 相交于,M N 两点(,M N 不是左右顶点），且0AM AN ⋅=.求证：直线l 过定点，并求出该定点的坐标.22．已知函数()()e 4ln 2xf x x x =++-.(1)求函数()f x 的图象在()()0,0f 处的切线方程；(2)判断函数()f x 的零点个数，并说明理由.参考答案：1．C【分析】根据复数代数形式的乘法运算化简复数2z ，再根据复数的几何意义判断即可.【详解】解：因为1z =-，所以())2221122z ==-+=--，所以2z 在复平面内对应的点的坐标为(2,--位于第三象限.故选：C 2．D【分析】计算出集合B ，由补集的定义即可得出答案.【详解】因为{}}{223031A xx x x x =+-<=-<<∣，U ðA=][()6,31,2--⋃.故选：D.3．D【分析】根据圆锥与圆柱的体积公式，可得答案.【详解】已知底面圆的半径2r =，由36AC AB ==，则2,4AB BC ==，故该陀螺的体积2215633V BC r AB r πππ=⋅+⋅⋅=.故选：D.4．B【分析】根据方差和平均数的计算及可求解.【详解】因为一组数据1x ，2x ，3x 的平均数是4，方差是2，所以22212312311()4,[(4)(4)(4)]233x x x x x x ++=-+-+-=，所以22212312312,(4)(4)(4)6x x x x x x ++=-+-+-=，所以12331,31,31x x x ---，11的平均数为12312311(31)(31)(31)][113()3]1144x x x x x x +-+-+-=+++-=，所以12331,31,31x x x ---，11的方差为2222123111)(312)(312)(312)]4x x x -+-+-+-22212311279[(4)(4)(4)]96424x x x =⨯-+-+-=⨯⨯=故选：B 5．D【分析】求出1,2a b ==，根据()2a b a -⊥ 可得()20a b a -⋅=,代入化简求解夹角余弦值即可.【详解】设a 与b的夹角为θ，因为()22,2a b a b a ==-⊥ ，所以1,2a b==，()2a b a ∴-⋅22cos 0a a b θ=-= .21cos 42a a b θ∴== .故选：D.6．B【分析】根据圆的方程，明确圆心与半径，进而确定两圆的位置关系，可得答案.【详解】由圆()()221:234O x y -+-=，则圆心()12,3O ，半径12r =；由圆222:2270O x y x y +++-=，整理可得()()22119x y +++=，则圆心()21,1O --，半径23r =；由12125O O r r ===+，则两圆外切，同时与两圆相切的直线有3条.故选：B.7．B【分析】求出周期，方法1：画图分析零点个数；方法2：求()0f x =的根解不等式即可.【详解】由题意知，37π2π(3π433T =--=，解得：4πT =，22Tπ=，方法1：∴作出函数图象如图所示，∴()f x 在区间[0,10π]上的零点个数为5.方法2：∴()0f x =，解得：2π2π,Z 3x k k =-+∈，∴2π02π10π3k ≤-+≤，Z k ∈，解得：11633k ≤≤，Z k ∈，∴1,2,3,4,5k =，∴()f x 在区间[0,10π]上的零点个数共有5个.故选：B.8．D【分析】由题意可知12PF e PF =，结合椭圆的定义解得221aPF e =+，再由2a c PF a c -≤≤+求解.【详解】因为12PF e PF =，所以12PF e PF =，由椭圆的定义得：122PF PF a +=，解得221aPF e =+，因为2a c PF a c -≤≤+，所以21aa c a c e -≤≤++，两边同除以a 得2111e e e -≤≤++，解得1e ≥，因为01e <<11e ≤<，所以该离心率e的取值范围是1,1)故选：D.9．BCD【分析】根据题意可得：π1tan πtan(2tan()31tan 4αααα--==-+，然后利用正切函数的性质即可求解.【详解】因为πtantan 1tan π4tan()π1tan 41tan tan 4ααααα--==-++⋅，则ππtan(2)tan()34αα-=-，所以ππ2π,34k k αα-=+-∈Z ，解得：π7π,336k k α=+∈Z ，当0k =时，7π36α=；当1k =时，19π36α=；当1k =-时，5π36α-=；故选：BCD .10．AD【分析】根据相互独立事件概率计算公式计算即可.【详解】由已知三人选择长跑的概率为111133327⨯⨯=，故A 正确.三人都不选择长跑的概率为222833327⨯⨯=，故B 错误.至少有两人选择跳绳的概率为231111127C 33333327⨯⨯+⨯⨯=，故C 错误.记至少有两人选择跳远为事件A ，所以()231111127C 33333327P A =⨯⨯+⨯⨯=.记丙同学选择跳远为事件B ，所以()12111215C 3333327P AB ⎛⎫=⨯+⨯⨯= ⎪⎝⎭.所以在至少有两人选择跳远的前提下，丙同学选择跳远的概率为()()()57P AB P B A P B ==，故D 正确.故选：AD 11．ABC【分析】根据题意可得()()()()1ln 1110g x x x k x =++--+>，利用导数结合分类讨论解决恒成立问题.【详解】若()()11f x k x >--恒成立，则()()()()()111ln 1110f x k x x x k x --+=++--+>恒成立，构建()()()()1ln 111g x x x k x =++--+，则()()ln 12g x x k '=++-，∵0x >，故()ln 10x +>，则有：当20k -≥，即2k ≤时，则()0g x '>当0x >时恒成立，故()g x 在()0,∞+上单调递增，则()()010g x g >=>，即2k ≤符合题意，故满足条件的正整数k 为1或2；当20k -<，即2k >时，令()0g x '>，则2e 1k x ->-，故()g x 在()20,e1k --上单调递减，在()2e 1,k --+∞上单调递增，则()()22e 1e 0k k g x g k --≥-=->，构建()2ek G k k -=-，则()21e0k G k --'=<当2k >时恒成立，故()G x 在()2,+∞上单调递减，则()()210G k G <=>，∵()()233e 0,44e 0G G =->=-<，故满足()()02G k k >>的整数3k =；综上所述：符合条件的整数k 为1或2或3，A 、B 、C 正确，D 错误.故选：ABC.12．BCD【分析】对于A ，利用线面垂直判定定理，明确点到平面的距离，利用三角形的性质，可得答案；对于B ，建立空间直角坐标系，求得直线的方向向量，利用向量夹角公式，可得答案；对于C ，利用等腰三角形的性质，结合面面垂直判定定理，可得答案；对于D ，利用线面垂直性质定理，结合直角三角形的性质以及锐角正切的定义，可得答案.【详解】对于A ，在平面ABC 内，过C 作CD AB ⊥，如下图所示：PA ⊥ 平面ABC ，且CD ⊂平面ABC ，PA CD ∴⊥，CD AB ⊥ ，PA AB A = ，,AB PA ⊂平面PAB ，CD \^平面PAB ，则C 到平面PAB 的距离为CD ，23BAC π∠= ，AB AC ==6ABC π∴∠=，在Rt BCD 中，sin sin 3CD CB CBA CBA =⋅∠=∠=，故A 错误；对于B ，在平面ABC 内，过A 作AE AB ⊥，且E BC ⊂，易知,,AB AE AP 两两垂直，如图建立空间直角坐标系：则()0,0,0A，()B，()C ，()0,0,4P ，得()AB =，()4PC =-，(6AB PC ⋅==-，AB =PC ==则cos ,14AB PC AB PC AB PC⋅==⋅ ，故B 正确；对于C，作图如下：在ABC 中，AB AC =，M 为BC 的中点，则AM BC ⊥，PA ⊥ 平面ABC ，BC ⊂平面ABC ，PA BC ∴⊥，AM PA A = ，,AM PA ⊂平面AMP ，BC ∴⊥平面AMP ，BC ⊂ 平面PBC ，∴平面PBC ⊥平面AMP ，故C 正确，对于D，作图如下：PA ⊥ 平面ABC ，AM ⊂平面ABC ，PA AM ∴⊥，则在Rt PAM 中，tan PAAMP AM∠=，当AM 取得最小值时，tan AMP ∠取得最大值，当M 为BC 的中点时，由C 可知，AM BC ⊥，AM 取得最小值为sin 6AB π⋅=则tan AMP ∠D 正确.故选：BCD.13．1【分析】由奇函数的定义求解即可.【详解】函数()()313xx k f x x k -=∈+⋅R 为奇函数，必有0k >，则()()3·31331331313x x x x x x x xk k k kf x f x k k k k -------===-=-=+⋅++⋅+⋅，于是得22223·31x x k k -=-恒成立，即21k =，解得：1k =.故答案为：1.14．【分析】先根据抛物线定义得P 点坐标，再根据三角形面积公式求解.【详解】因为5PF =，所以2253,24,||P P P P x x y y +=∴===因此POF ∆的面积为11||||=22P y OF ⨯【点睛】本题考查抛物线定义应用，考查基本分析转化与求解能力，属基础题.15．78【分析】能被5整除的三位数末位数字是5或0，分成末位数字是5和末位数字是0两种情况讨论.【详解】能被5整除的三位数说明末尾数字是5或0当末尾数字是5时，百位数字除了0有6种不同的选法，十位有6种不同的选法，根据分步乘法原理一共有6636⨯=种方法；当末尾数字是0时，百位数字有7种不同的选法，十位有6种不同的选法，根据分步乘法原理一共有7642⨯=种方法；则一共有364278+=种故答案为：7816．13≤3>讨论，得出()g x 在[)3,+∞上的最小值，由最小值为2求解a 的值即可得出答案.【详解】()22ag x x x+=+- ，()()(2222221x x x a a g x x x x-+-+=∴+'=-=，3≤时，即07a <≤时，则()0g x '>在()3,+∞上恒成立，则()g x 在[)3,+∞上单调递增，()g x ∴在[)3,+∞上的最小值为()5323ag +==，解得1a =，3>时，即7a >时，当x ∈⎡⎣时，()0g x '<，()g x 单调递减，当)x ∈+∞时，()0g x '>，()g x 单调递增，()g x ∴在[)3,+∞上的最小值为22,2ga ===，舍去，综上所述：1a =，故答案为：1.17．ˆ 3.7 4.9yx =+；9.【分析】根据表中数据及平均数公式求出ˆˆ,ab ，从而求出回归方程，然后再根据一天中滑雪人数超过3500人时，当天滑雪场可实现盈利即可求解.【详解】由题意可知，1234535x ++++==，911142620165y ++++==，所以()()()()()()()()5113916231116331416iii x x yy =--=-⨯-+-⨯-+-⨯-∑()()()()432616532016+-⨯-+-⨯-()()()()()27150211024=-⨯-+-⨯-+⨯-+⨯+⨯145010837=++++=()()()()()()5222222113233343534101410ii x x =-=-+-+-+-+-=++++=∑，所以()()()51521373.710iii ii x x y y bx x ==--===-∑∑ ，ˆˆ16 3.73 4.9ay bx =-=-⨯=，所以y 关于x 的回归方程为ˆ 3.7 4.9yx =+.因为天中滑雪人数超过3500人时，当天滑雪场可实现盈利，即3.7 4.935x +>，解得30.18.143.7x >≈,所以根据回归方程预测，该该滑雪场开业的第9天开始盈利.18．(1)(2)π4【分析】（1）在ABC 中，利用面积公式、余弦定理运算求解；（2）在ACD 中，利用正弦定理运算求解，注意大边对大角的运用.【详解】（1）在ABC 中，由ABC的面积111sin 222S AB BC B BC =⨯⨯∠=⨯⨯=可得4BC =，由余弦定理2222cos 121624522AC AB BC AB BC B ⎛⎫=+-⨯⨯∠=+-⨯⨯-= ⎪ ⎪⎝⎭，即AC =（2）在ACD 中，由正弦定理sin sin AC ADD ACD=∠∠，可得sin sin AD D ACD AC ∠∠==∵AD AC <，则60ACD D ∠<∠=︒，故π4ACD ∠=.19．(1)2n n a =(2)7【分析】（1）当2n ≥时，构造11228n n S a n --=+-，与条件中的式子，两式相减，得122n n a a -=-，转化为构造等比数列求通项公式；（2）由（1）可知()()1111222222n n n n n n n b a a ++++==++，利用分组求和法求解.【详解】（1）因为226n n S a n =+-，所以当1n =时，1124S a =-，解得14a =．当2n ≥时，11228n n S a n --=+-，则11222n n n n S S a a ---=-+，整理得122n n a a -=-，即()1222n n a a --=-．所以数列{}2n a -是首项为2，公比为2的等比数列，所以12222n n n a --=⨯=．所以22n n a =+.（2）令()()111112211222222222n n n n n n n n n b a a +++++⎛⎫===- ⎪++++⎝⎭，数列{}n b 的前m 项和1111111112+4661010142222m m m T +⎛⎫=-+-+-+- ⎪++⎝⎭ ，111112=2422222m m ++⎛⎫-=- ++⎝⎭，则112127222258m +-=+，则12222258m +=+，则122567m m +=⇒=.m 的值为7.20．(1)证明见解析【分析】（1）建立空间直角坐标系，利用空间向量法证明10EC BP ⋅= ，10EA BP ⋅=，即可得证；（2）利用空间向量法计算可得.【详解】（1）证明：如图建立空间直角坐标系，则()0,0,2E ，()4,4,0B ，()14,4,4B ，()2,2,4P ，()10,4,4C ，()14,0,4A ，()0,4,0C ，所以()10,4,2EC = ，()14,0,2EA =，()2,2,4BP =-- ，所以10EC BP ⋅= ，10EA BP ⋅=，所以1EC BP ⊥，1EA BP ⊥，又11EC EA E = ，11,EC EA ⊂平面11A EC ，所以BP ⊥平面11A EC.（2）解：由（1）可知()2,2,4BP =-- 可以为平面11A EC 的法向量，又()14,0,4B C =--，设直线1B C 与平面11A EC 所成角为θ，则11sin 6B C BP B C BPθ⋅==⋅=，故直线1B C 与平面11A EC 21．(1)2214x y -=(2)证明过程见解析，定点坐标为10,03⎛⎫⎪⎝⎭【分析】（1）由渐近线方程求出12b a =，根据焦点到渐近线距离列出方程，求出c =，从而求出2,1a b ==，得到双曲线方程；（2）:l y kx m =+与2214x y -=联立，求出两根之和，两根之积，由0AM AN ⋅= 列出方程，求出103m k =-或2m k =-，舍去不合要求的情况，求出直线过定点，定点坐标为10,03⎛⎫⎪⎝⎭.【详解】（1）因为渐近线方程为20x y -=，所以12b a =，焦点坐标(),0c 到渐近线20x y -=1=，解得：c ，因为2225a b c +==，解得：2,1a b ==，所以双曲线C 的方程为2214x y -=；（2）由题意得：()2,0A ，:l y kx m =+与2214x y -=联立得：()222148440k x kmx m ----=，设()()1122,,,M x y N x y ，则2121222844,1414km m x x x x k k --+==--，()()()2212121212y y kx m kx m k x x km x x m =++=+++，()()()11221212122,2,24AM AN x y x y x x x x y y ⋅=-⋅-=-+++()()()()()122222222124048142421441kx x km x km m k x mkm m k k++-++--++=+⋅+-⋅+-=-，化简得：22201630k km m ++=，解得：103m k =-或2m k =-，当103m k =-时，10:3l y k x ⎛⎫=- ⎪⎝⎭恒过点10,03⎛⎫ ⎪⎝⎭，当2m k =-时，():2l y k x =-恒过点()2,0A ，此时,M N 中有一点与()2,0A 重合，不合题意，舍去，综上：直线l 过定点，定点为10,03⎛⎫⎪⎝⎭，【点睛】处理定点问题的思路：（1）确定题目中的核心变量（此处设为k ），（2）利用条件找到k 与过定点的曲线(),0F x y =的联系，得到有关k 与,x y 的等式，（3）所谓定点，是指存在一个特殊的点()00,x y ，使得无论k 的值如何变化，等式恒成立，此时要将关于k 与,x y 的等式进行变形，直至找到()00,x y ，①若等式的形式为整式，则考虑将含k 的式子归为一组，变形为“()k ⋅”的形式，让括号中式子等于0，求出定点；②若等式的形式是分式，一方面可考虑让分子等于0，一方面考虑分子和分母为倍数关系，可消去k 变为常数.22．(1)14ln 2=+y (2)有两个零点，理由见解析【分析】（1）根据导数的几何意义，结合导数的运算进行求解即可；（2）令()0f x =转化为()()2=e <xt x x 与()()()4ln 22=---<g x x x x 图象交点的个数，利用导数得到()g x 单调性，结合两个函数的图象判断可得答案.【详解】（1）()()4e 122xf x x x =+-<-'，所以切线斜率为()00e 10204'=+-=-f ，()()00e 04ln 2014ln 2=++-=+f ，所以切点坐标为()0,14ln 2+，函数()f x 的图象在()()0,0f 处的切线方程为14ln 2=+y ；（2）有两个零点，理由如下，令()()e 4ln 20=++-=xf x x x ，可得()e 4ln 2=---x x x ，判断函数()f x 的零点个数即判断()()2=e <xt x x 与()()()4ln 22=---<g x x x x 图象交点的个数，因为()=e xt x 为单调递增函数，()0t x >，当x 无限接近于-∞时()t x 无限接近于0，且()22=e t ，由()421=022+'=-+=--x g x x x，得2x =-，当22x -<<时，()0g x '>，()g x 单调递增，当<2x -时，()0g x '<，()g x 单调递减，所以()224ln40-=-<g ，()3333e 2e 24lne e 100--=+-=->g ，()110g =-<，43314ln ln 0222⎛⎫=--= ⎪⎝⎭g ，且当x 无限接近于2时()g x 无限接近于+∞，所以()=e xt x 与()()4ln 2=---g x x x 的图象在0x <时有一个交点，在02x <<时有一个交点，综上函数()f x 有2个零点.【点睛】方法点睛：已知函数有零点(方程有根)求参数值(取值范围)常用的方法：（1）直接法：直接求解方程得到方程的根，再通过解不等式确定参数范围；（2）分离参数法：先将参数分离，转化成求函数的值域问题加以解决；（3）数形结合法：先对解析式变形，进而构造两个函数，然后在同一平面直角坐标系中画出函数的图象，利用数形结合的方法求解。
计算机专业基础综合(计算机组成原理)模拟试卷4(题后含答案及解析)
计算机专业基础综合（计算机组成原理）模拟试卷4(题后含答案及解析)题型有：1. 单项选择题 2. 综合应用题单项选择题1-40小题，每小题2分，共80分。
下列每题给出的四个选项中，只有一个选项是最符合题目要求的。
1．下列关于相联存储器的说法中，错误的是( )。
A．相联存储器指的是按内容访问的存储器B．在实现技术相同的情况下，容量较小的相联存储器速度较快C．相联存储器结构简单，价格便宜D．在存储单元数目不变的情况下，存储字长变长，相联存储器的访问速度下降正确答案：C解析：此题考查相联存储器的基本概念。
知识模块：计算机组成原理2．下列关于DRAM和SRAM的说法中，错误的是( )。
I．SRAM 不是易失性存储器，而DRAM是易失性存储器Ⅱ．DRAM比SRAM集成度更高，因此读写速度也更快Ⅲ．主存只能由DRAM构成，而高速缓存只能由SRAM构成Ⅳ．与SRAM相比，DRAM由于需要刷新，所以功耗较高A．Ⅱ、Ⅲ幂口ⅣB．I、Ⅲ和ⅣC．I、Ⅱ和ⅢD．I、Ⅱ、Ⅲ和Ⅳ正确答案：D解析：SRAM和DRAM都属于易失性存储器，掉电就会丢失，故I错误。
SRAM的集成度虽然更低，但速度更快，因此通常用于高速缓存Cache，故Ⅱ错误。
主存可以用SRAM实现，只是成本高，故Ⅲ错误。
与SRAM相比，DRAM 成本低、功耗低，但需要刷新，故Ⅳ错误。
知识模块：计算机组成原理3．某机字长32位，主存容量1MB，按字编址，块长512 B，Cache共可存放16个块，采用直接映射方式，则Cache地址长度为( )。
A．11位B．13位C．18位D．20位正确答案：A解析：主存地址中除去主存字块标记的部分就是Cache地址，结构如下所示：而Cache地址的格式如下图所示：其中，块长512 B，主存按字(32位)编址，512 B／4 B=128=27，即块内字地址7位；Cache共可存放16个块，采用直接映射方式，24=16，即Cache字块地址4位。
经济学基础模拟试卷四附答案
经济学基础模拟试卷四1. 当某种商品的需求和供给同时减少时，则（）A.均衡价格下降，均衡数量减少B.均衡价格下降，均衡数量无法确定C.均衡价格无法确定，均衡数量减少D.均衡价格上升，均衡数量减少2. 无差异曲线为斜率不变的直线时，表示相结合的两种商品是（）A.可以替代的B.完全替代的C.互补的D.互补相关的3. 在MR=MC的均衡产量上，企业（）A.必然得到最大的利润B.不可能亏损C.必然得到最小的亏损D.若获利润，则利润最大；若亏损，则亏损最小4. 某种商品的某生产者的正斜率供给曲线表明了（）A.生产者愿望的最大限度B.生产者愿望的最小限度C.在一种意义下是生产者愿望的最大限度，在另一种意义下是生产者愿望的最小限度D.以上都不对5. 等成本曲线平行向外移动表明（）A.成本增加了B.生产要素的价格按相同比例提高了C.产量提高了D.生产要素的价格按不同比例提高了6. 在总产量、平均产量和边际产量的变化过程中,下列（）首先发生。
A.边际产量下降B.平均产量下降C.总产量下降和C7. 如果人们收入水平提高,则食物支出在总支出中的比重将（）A.大大增加B.稍有增加C.下降D.不变8. 使用自有资金也应计算利息收入，这种利息从成本角度看是（）A. 固定成本B. 隐性成本C. 会计成本D. 显性成本9. 在下列各项中，不属于生产要素的是（）A.农民拥有的土地B.企业家的才能C.在柜台上出售的产品－服装D.煤矿工人采煤时所付出的低廉的劳动10. 在完全竞争市场中，企业的主要竞争策略是（）A.广告促销B.降价促销C.涨价盈利D.降低成本11. 某低档商品的价格下降，在其它情况不变时，（ ）A .替代效应和收入效应相互加强导致该商品需求量增加B .替代效应和收入效应相互加强导致该商品需求量减少C .替代效应倾向于增加该商品的需求量，而收入效应倾向于减少其需求量D .替代效应倾向于减少该商品的需求量，而收入效应倾向于增加其需求量12. 等产量曲线（ ）A.说明了为生产一个给定的产出量而可能的各种投入要素的组合B.除非得到所有要素的价格,否则不能画出该曲线C.说明了投入与产出的关系D.表示无论投入数量怎样变化,产出量都是一定的13. 垄断竞争市场上厂商的短期均衡发生于（ ）A. 边际成本等于实际需求曲线中产生的边际收益时B. 平均成本下降时C. 主观需求曲线与平均成本曲线相切时D. 主观需求曲线与实际需求曲线相交，并有边际成本等于主观需求曲线中产生的边际收益时14. 准租金与厂商的经济利润相比（ ）A. 相等B. 前者大C. 后者大D. 均有可能15. 完全竞争市场的厂商短期供给曲线是指（ ）＞MC 中的那部分AVC 曲线 ＞MC 中的那部分AC 曲线≥ AVC 中的那部分MC 曲线 ≥ AC 中的那部分MC 曲线16. 产品转换曲线是从（ ）导出的。
DAMA-CDGA(数据治理工程师)-模拟卷4
1 数据质量规则和测量结果是：______A. 操作元数据B. 行业元数据C. 业务元数据D. 战略元数据E. 技术元数据正确答案：C2 一个术语是指将星型模式中的单表、维度结构规范化为的树型分层或网络结构。
这个术语叫______A. 完全面向通信的信息建模（FCO-IM）B. 维度表C. 微粒D. 雪花模型E. 符合维度正确答案：D3 一个术语是对数据要求的详细表述，通常是为了支持具体的使用场景，例如应用需求。
这个术语被称为______A. 标准数据模型B. 概念数据模型C. 逻辑数据模型D. 物理数据模型E. 主题域模型正确答案：C4 一个术语是指将自己附着在可执行文件或易受攻击的应用程序上，并提供一个极具破坏性的有效载荷的程序。
这个术语被称为______A. 广告软件B. 病毒C. 社会工程学D. 内外网隔离区（DMZ）E. 威胁正确答案：B5 授予个人访问适合其角色的特定数据视图的权限，这被称为______。
A. 分析B. 复制C. 归档D. 授权E. 威胁正确答案：D6 核验用户的访问。
当一个用户试图登录一个系统时，系统需要查验这个人是否是他或她声称的人，密码是一种方法。
这被称为______A. 分析B. 复制C. 归档D. 验证E. 威胁正确答案：D7 审查安全行动和用户活动，以确保符合法规并符合公司政策和标准。
这被称为______A. 分析B. 复制C. 归档D. 审计E. 威胁正确答案：D8 这个术语既指损失的可能性，也指构成潜在损失的事物或条件。
这个术语被称为______A. 分析B. 复制C. 归档D. 审计E. 风险正确答案：E9 当一个组织有以下哪种情况时，会给予正式批准文件？A. 采集并存储在其数据库中的数据B. 被黑客攻击，关于个人的信息被公开C. 在收集、使用或披露个人信息时，获得了信息个体的同意D. 与其数据管理委员会一起审查其现行政策E. 公布有关其政策和做法的具体信息正确答案：C10 在数据处理道德伦理学中，“社会许可”指的是在以下哪个方面的一致性？A. 利益相关者的要求和技术成果B. 社会的需求和他们获取数据的权利C. 利益相关者的期望和组织D. 社会和政治决策矩阵E. 公众的看法和公布的事实正确答案：E11 ______是对一个组织可能采取的潜在进攻性行动。
(全国I卷)2020年高考语文模拟试卷四附答案解析
（全国I卷）2020年高考语文模拟试卷四)第I卷阅读题一、现代文阅读（36分）（一）论述类文本阅读（本题共3小题，9分）阅读下面的文字，完成1—3题。
青春心态：“五四”文学审美心理素描这个概括来源于徐志摩，《默境》中他写道：但见玫瑰丛中，青春的舞蹈与欢容，只闻歌颂青春的谐乐与欢踪。
轻捷的步履，你永向前领；欢乐的光明，你永向前引，我是个崇拜青春、欢乐与光明的灵魂。
这里青春、欢乐、光明是三位一体的，“五四”作家的宗教就是青春与欢乐、光明三位一体的“青春教”。
“五四”作家不是将欢乐当成是一种消费和闲暇来对待的，“五四”作家不是简单地将光明当作外在于个人的目标来认识的，他们是将欢乐、光明融合在个体的人的生命形态——“青春”之中，“五四”作家的青春教又是光明教和欢乐教。
正因如此，“五四”文学开辟出一条以欢乐、光明、青春心态为宗旨的审美战线以反对封建文学的自虐、黑暗、老年心态。
“五四”新文化运动的倡导者们是以青年为突破口来建设“五四”青春型文化的。
1915年陈独秀创办《新青年》杂志（第一卷名《青年杂志》，第二卷起改名《新青年》），在其发刊词《敬告青年》中竭力赞美青年。
《新青年》杂志将“改造青年之思想，辅导青年之修养”作为自己的天职；1916年李大钊在《新青年》2卷1号上发表《青春》一文，认为中国以前之历史为白首之历史，而中国以后之历史应成为“青春之历史，活青年之历史”。
“五四”新文化运动从本质上讲就是一场青年文化运动，它标志着中国传统的长老型文化的终结和中国现代青春型文化的诞生。
由此“五四”文学运动在这一背景中是与整个“五四”文化运动的青春型转向相应和的。
“五四”新文学作家主体是青年，从新文学的创作主体这一角度来说，将“五四”文学说成是青年的文学是完全不过分的。
以1918年时“五四”作家的年龄为例，陈独秀、鲁迅两人算是比较大一些，其余李大钊29岁，周作人33岁，钱玄同31岁，刘半农28岁，沈伊默35岁，胡适27岁，都是很年轻的，至于郭沫若、郁达夫、张资平、陶晶孙、冯沅君、庐隐、石评梅、冰心、丁玲等冲上“五四”文坛时许多人只20出头。
中国现代文学史模拟试卷(四)和答案
北京语言大学网络教育学院《中国现代文学史》模拟试卷四一、【单项选择题】(本大题共15小题，每小题2分，共30分)在每小题列出的四个选1、下列均属于文学研究会的作家是（ A ）。
[A]沈雁冰、周作人、朱自清、郑振铎[B]沈雁冰、叶绍钧、朱自清、郑振铎[C] 沈雁冰、周作人、冰心、梁实秋[D]沈雁冰、叶绍钧、冰心、郑伯奇2、1932年9月，左联领导下的群众性的诗歌团体中国诗歌会成立，其会刊是（ C ）。
[A] 《诗》[B] 《拓荒者》[C] 《新诗歌》[D] 《中国诗歌》3、徐志摩最早出版的诗集是（ B ）。
[A] 《翡冷翠的一夜》[B] 《志摩的诗》[C] 《猛虎集》[D] 《云游集》4、边城的女主人公是（ C ）。
[A] 阿黑[B] 夭夭[C] 翠翠[D] 萧萧5、鲁迅揭露中国几千年的历史是“暂时做稳了奴隶的时代”和“想做奴隶而不得的时代”的循环的作品是（ A ）。
[A] 《灯下漫笔》[B] 《论睁了眼睛看》[C] 《忽然想到》[D] 《春末闲谈》6、《寒夜》体现了巴金的美学理想，即（ D ）。
[A] 无政府主义[B] 人道主义[C] 塑造小人物[D] 无技巧的艺术7、沈从文讽刺知识分子的代表作是（ D ）。
[A] 《柏子》[B] 《月下小景》[C] 《长河》[D] 《八骏图》8、《财主底儿女们》的出版当时被胡风称作是（ D ）。
[A] 中国新文学的重要收获[B] 40年代小说的扛鼎之作[C] 路翎小说创作的突破[D] 中国新文学史上的一个重大的事件9、下列均属于郭沫若创作的诗集是（ B ）。
[A] 《女神》、《前茅》、《瓶》、《红烛》[B] 《女神》、《前茅》、《瓶》、《恢复》[C] 《女神》、《前茅》、《恢复》、《猛虎集》[D] 《女神》、《瓶》、《恢复》、《黎明的通知》10、张天翼《速写三篇》包括的三篇作品是（ B ）。
[A] 《三天半的梦》、《华威先生》、《新生》[B] 《谭九先生的工作》、《华威先生》、《新生》[C] 《脊背与奶子》、《三天半的梦》、《华威先生》[D] 《包氏父子》、《谭九先生的工作》、《新生》11、提出“伟大的文学乃是基于固定的普遍的人性”，“文学是没有阶级性的”这一文学观点的是（ D ）。
2021年大学英语四级(CET-4)真题模拟试卷4【附答案】
2021年大学英语四级(CET-4)真题模拟试卷4【附答案】Part I Writing (30 minutes)Directions:For this part, you are allowed 30 minute to write a short essay on the topic of students selecting their lectures. You should write at least 120words following the outline given bellow:1.越来越多的博物馆免费对外开放的目的是什么？2.也会带来一些问题3.你的看法？Free admission to museumsPart II Reading Comprehension (Skimming and Scanning) (15 minutes) Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose thebest answer from the four choices marked A),B),C) and D). For questions8-10, complete the sentences with the information given in the passage.How Do You See Diversity?As a manager, Tiffany is responsible for interviewing applicants for some of the positions with her company .During one interview, she noticed that the candidate never made direct eye contact. She was puzzled and somewhat disappointed because she liked the individual otherwise.He had a perfect resume and gave good responses to her questions, but the fact that he never looked her in the eye said “untrustworthy,” so she decided to offer the job to her second choice.“It wasn’t until I attended a diversity workshop that I realized the person we passed over was the perfect person,” Tiffany confesses. What she hadn’t known at the time of the interview was that the candidate’s “different” behavior was simply a cultural misunderstanding . He was an Asian-American raised in a household where respect for those in authority was shown by averting(避开) your eyes.“I was just thrown off by the lack of ye contact; not realizing it was cultural,”Tiffany says. “I missed out ,but will not miss that opportunity again.”Many of us have had similar encounters with behaviors we perceive as different. As the world becomes smaller and our workplaces more diverse, it is becoming essential to expand our under-standing of others and to reexamine some of our false assumptions .Hire AdvantageAt a time when hiring qualified people is becoming more difficult ,employers who can eliminate invalid biases(偏爱) from the process have a distinct advantage .My company, Mindsets LLC ,helps organizations and individuals see their own blind spots . A real estate recruiter we worked with illustrates the positive difference such training can make .“During my Mindsets coaching session ,I was taught how to recruit a diversified workforce. I recruited people from different cultures and skill sets .The agents were able to utilize their full potential and experiences to build up the company .When the real estate market began to change, it was because we had a diverse agent pool that we were able to stay in the real estate market much longer than others in the same profession.”Blinded by GenderDale is an account executive who attended one of my workshops on supervising a diverse workforce . “Through one of the sessions ,I discovered my personal bias ,” he recalls . “I learned I had not been looking at a person as a whole person , and being open to differences .” In his case , the blindness was not about culture but rather gender .“I had a management position open in my department ;and the two finalists were a man and a woman . Had I not attended this workshop , I would have automatically assumed the man was the best candidate because the position required quite a bit of extensive travel . My reasoning would have been that even though both candidates were great and could have been successful in the position , I assumed the woman would have wanted to be home with her children and not travel .”Dale’s assumptions are another example of the well-intentioned but incorrect thinking that limits an organization’s ability to tap into the full potential of a diverse workforce .“I learned from the class that instead of imposing my gender biases into the situation , I needed to present the full range of duties, responsibilities and expectations to all candidates and allow them to make an informed decision .” Dale credits the workshop , “because it helped me make decisions based on fairness .”Year of the Know-It-AllDoug is another supervisor who attended one of my workshops .He recalls a major lesson learned from his own employee.“One of my most embarrassing moments was when I had a Chinese-American employee put in a request to take time off to celebrate Chinese New Year . In my ignorance , I assumed he had his dates wrong , as the first of January had just passed .When I advised him of this , I gave him a long talking-to about turning in requests early with the proper dates .“He patiently waited , then when I was done , he said he would like Chinese New Year did not begin January first , and that Chinese New Year ,which is tied to the lunar cycle ,is one of the most celebrated holidays on the Chinese calendar . Needless to say , I felt very embarrassed in assuming he had his dates mixed up . But I learned a great deal about assumptions , and that the timing of holidays varies considerably from culture to culture .“Attending the diversity workshop helped me realize how much I could learn by simply asking questions and creating dialogues with my employees , rather than making assumptions and trying to be a know-it-all ,” Doug admits . “The biggest thing I took away from the workshop is learning how to be more ‘inclusive’ to differences.”A better Bottom LineAn open mind about diversity not only improves organizations internally , it is profitable as well . These comments from a customer service representative show how an inclusive attitude can improve sales .”Most of my customers speak English as a second language . One of the best things my company has done is to contract with a language service that offers translations over the phone . It wasn’t until my boss received Mindsets’ training that she was able to understand how important inclusiveness was to customer service . As result , our customer base has increased .”Once we start to see people as individuals . and discard the stereotypes , we can move positively toward inclusiveness for everyone . Diversity is about coming together and taking advantage of our differences and similarities . It is about building better communities and organizations that enhance us as individuals and reinforce our shared humanity .When we begin to question our assumptions and challenge what we think we have learned from our past , from the media, peers , family , friends , etc , we begin to realize that some of our conclusions are flawed(有缺陷的) or contrary to our fundamental values . We need to train our-selves to think differently , shift our mindsets and realize that diversity opens doors for all of us ,creating opportunities in organizations and communities that benefit everyone .1.What bothered Tiffany during an interview with her candidate?A)He just wouldn’t look her in the eye.B)He was slow in answering her questions.C)His answers to some of her questions were irrelevant.D)His answers to some of her questions were irrelevant .2. Tiffany’s misjudgment about the candidate stemmed from .A) Racial stereotypes. C) Racial stereotypes.B) Invalid personal bias . D) Emphasis on physical appearance3. What is becoming essential in the course of economic globalization accordingto the author?A) Hiring qualified technical and management personnel.B) Increasing understanding of people of other cultures.C) Constantly updating knowledge and equipment.D) Expanding domestic and international markets.4. What kind of organization is Mindsets LLC?A) A real estate agency. C) A cultural exchange organization.B) A personnel training company. D) A hi-tech company5. After one of the workshops ,account executive Dale realized that .A) He had hired the wrong person.B) He could have done more for his company.C) He had not managed his workforce well.D) He must get rid of his gender bias.6. What did Dale think of Mindsets LLC’s workshop?A) It was well-intentioned but poorly conducted.B) It tapped into the executives’ full potential.C) It helped him make fair decisions.D) It met participants’ diverse needs.7. How did Doug, a supervisor, respond to a Chinese-American employee’srequest for leave?A)He told him to get the dates right. C)He flatly turned it downB)He demanded an explanation. D)He readily approved it.8. Doug felt when he realized that his assumption was wrong.9. After attending Mindsets’ workshops, the participants came to know theimportance of to their business.10. When we view people as individuals and get rid of stereotypes , we canachieve diversity and benefit from the between us.Part III Listening Comprehension (35 Minutes) Section ADirections: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions willbe asked about what was said .Both the conversation and the questionswill be spoken only once .After each question there will be a pause . Duringthe pause, you must read the four choices marked A),B),C) and D), anddecide which is the best answer. Then mark the corresponding letter onAnswer sheet 2 with a single line through the centre.11. A) She expected more people at her party.B) She enjoys entertaining small children.C) She threw a surprise party for her friendD) She has always enjoyed great popularity.12. A) They are not used to living in a cold place.B) They feel lucky to live in Florida.C) They are going to have a holiday.D) They have not booked their air tickets yet.13. A) He was pleased to get the medal. C) He used to be a firefighter.B) He was very courageous. D) He was accused of causing a fire.14. A) Make a profitable investment. C) Get parts for the machine from Japan.B) Buy a new washing machine D) Have the old washing machine fixed.15. A) He is pleased with his exciting new job.B) He finds the huge workload unbearable.C) He finds his office much too big for him.D) He is not so excited about his new position.16. A) The woman is going to hold a big party tomorrow.B) The man has no idea what the right thing to do is.C) The woman doesn’t know how to get to the party.D) The man offers to drive the woman to the party.17. A) Drawing up a business plan. C) Finalizing a contract.B) Discussing a term paper. D) Reviewing a co-authored article.18. A) She ordered some paper. C) She chatted online with a friendB) She had the printer repaired. D) She filled in an application form Questions 19 to 22 are based on the conversation you have just heard.19. A) His health is getting worse. C) His past life upsets him a good deal.B) He can no longer work at sea. D) He has not got the expected pension.20. A) She passed away years ago. C) She has been working at a clinic.B) She used to work as a model. D) She has been seriously ill for years.21. A) She has made lots of money as a doctor.B) She is going to take care of her old dad.C) She has never got on with her father.D) She is kind and generous by nature.22. A) He dines out with his wife every weekend.B) He is excellent but looks had-tempered.C) He does not care about his appearance.D) He is not quite popular with his patients.Questions 23 to 25 are based on the conversation you have just heard.23. A) The man has sent the order to the woman by mistakeB) Some of the telephone systems don’t work properlyC) Some of the packs do not contain any manuals.D) The quality of the goods is not up to the standard.24. A) Send a service engineer to do the repairs.B) Consult her boss about the best solution.C) Pass the man’s order to the right person.D) The quality of the goods is not up to the standard.25. A) Ideal. C) PartialB) Temporary D) CreativeSection BDirections:In this section, you will hear 3 short passages .At the end of each passage .You will hear some questions. Boss the passage and the questions will bespoken only once. After you hear a question, you must choose the bestanswer from the four choices marked A),B),C) and D). Then thecorresponding letter on Answer Sheet 2 with a single line through thecentre.Passage OneQuestions 26 to 28 are based on the passage you have just heard.26. A) It is entertaining. C) It takes lots of time.B) It is a costly hobby. D) It requires training.27. A) They can harm nearby plants. C) They fight each other for food.B) They may catch some disease. D) They may pollute the environment.28. A) Place the food on warmer spots. C) Avoid using any contaminated food.B) Use prepared feed mixtures only. D) Continue the feeding till it gets warm. Passage TwoQuestions 29 to 32 are based on the passage you have just heard.29. A) He will betray even his best friends.B) He is able to make up good excuses.C) He will lie whenever he wants.D) He tries to achieve his goal at any cost30. A) She made him apologize C) She broke up with him.B) She readily forgave him D) She refused to answer his calls.31. A) Buy her a new set of tires. C) Lend her his batteries.B) Help clean her apartment. D) Move furniture for her.Passage ThreeQuestions 32 to 35 are based on the passage you have just heard.32. A) The atmosphere they live in is rather unreal.B) Their parents put too much pressure on them.C) It’s hard for them to get along with other kids.D) They have to live in the shadow of their parents.33. A) He always boasts about his rich father.B) He will grow up to be good for nothing.C) He has too much to know the value of things.D) He is too young to manage his inherited property.34. A) She wants Amanda to get professional care.B) She has no experience in raising children.C) She wants to show off her wealth.D) She has no time to do it herself.35. A) The lifestyle depicted in Hollywood movies.B) The worship of money, beauty and pleasure.C) The attention the media focuses on them.D) The pursuing of perfection in performance.Section CDirections : In this section , you will hear a passage three times .When the passage isread for the first time, you should listen carefully for its general idea .When the passage is read for the second time, you are required to fill inthe blanks numbered from 36 to 43 with the exact words you have justheard. For blanks numbered from 44 to 46 you are required to fill in themissing information. For these blanks, you can either use the exact wordsyou have just heard or write down the main points in your own words.Finally, when the passage is read for the third time, you should check whatyou have written .Around 120 years ago, Ebbinghaus began his study of memory. He(36) .onstudying how quickly the human mind can remember (37) . One result of hisresearch is known as the total time hypothesis(假设), which simply means the amountyou learn (38) on the time you spend trying to learn it . This can be taken asour first rule of learning.Although it is usually true that studying for four hours is better than studying forone, there is still the question of how we should use the four hours. For example, is itbetter to study for four hours (39) or to study for one hour a day for four days ina (40) ?. The answer, as you may have (41) , is that it is better to spreadout the study times. This (42) , through which we can learn more (43) .bydividing our practice time, is known as the distribution of practice effect. Thus, (44).But we’re not finished yet. We haven’t considered how we should study oververy short periods of time. (45).Should you look at the same wordin rapid succession, or look at the word and then have some delay before you look at itagain ?(46).Part IV Reading Comprehension (reading in depth) (25 minutes) Section ADirections:In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bankfollowing the passage. Read the passage through carefully before makingyour choices. Each choice in bank is identified by a letter. Please markthe corresponding letter for each item on Answer Sheet 2 with a singleline through the centre. You may not use any of the words in the bankmore than once.Questions 47 to 56 are based on the following passage.Every year in the first week of my English class, some students inform me that writhing is too hard. They never write, unless assignments 47 it . They fine the writing process 48 and difficult.How awful to be able to speak in a language but not to write in it- 49 English , with its rich vocabulary . Being able to speak but not write is like living in an 50 mansion(豪宅) and never leaving one small room . When I meet students who think they can’t write, I know as a teacher my 51 is to show them the rest of the rooms . My task is to build fluency while providing the opportunity inherent in any writing activity to 52 the moral and emotional development of my students . One great way to do this is by having students write in a journal in class every day.Writing ability is like strength training. Writing needs to be done 53 , just like exercise ; just as muscles grow stronger with exercise , writing skills improve quickly with writing practice. I often see a rise in student confidence and 54 after only a few weeks of journal writing .Expressing oneself in writing is one of the most important skills I teach to strengthen the whole student. When my students practice journal writing, they are practicing for their future academic, political, and 55 lives . They build skills so that some day they might write a great novel, a piece of sorely needed legislation, or the perfect love letter. Every day that they write in their journals puts them a step 56 to fluency , eloquence (雄辩), and command of language .A)closer I) painfulB)daily J) performanceC)emotional K) professionD)enhance L) remarkablyE)enormous M) requireF)especially N) sensitiveG)hinder O) urgeH)missionSection BDirections:There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are fourchoices marked A), B), C) and D). You should decide on the best choiceand mark the corresponding letter on Answer Sheet 2 with a single linethrough the centre.Passage OneQuestions 57 to 61 are based on the following passage.The January fashion show, called FutureFashion , exemplified how far green design has come. Organized by the New York-based nonprofit Earth Pledge, the show inspired many top designers to work with sustainable fabrics for the first time. Several have since made pledges to include organic fabrics in their lines.The designers who undertake green fashion still face many challenges. Scott Hahn, cofounder with Gregory of Rogan and Loomstate, which uses all-organic cotton, says high-quality sustainable materials can still be tough to fine . “Most designers with existing labels are finding there aren’t comparable fabrics that can just replace what you’re doing and shat your customers are used to,” he says. For example, organic cotton and non-organic cotton are virtually indistinguishable once woven into a dress. But some popular synthetics, like stretch nylon, still have few eco-friendly equivalents.Those who do make the switch are finding they have more support. Last year the influential trade show Designers & Agents stopped charging its participation fee for young green entrepreneurs(企业家) who attend its two springtime shows in Los Angeles and New York and gave special recognition to designers whose collections are at least 25% sustainable . It now counts more than 50 green designers, up from fewer than a dozen two years ago. This week Wal-Mart is set to announce a major initiative aimed at helping cotton farmers go organic: it will buy transitional(过渡型的) cottonat higher prices , thus helping to expand the supply of a key sustainable material . “Mainstream is about to occur,” says Hahn.Some analysts(分析师) are less sure . Among consumers, only 18%are even aware that ecofashion exists, up from 6% four years ago. Natalie Hormilla, a fashion writer, is an example of the unconverted consumer, when asked if she owned any sustainable clothes, she replied: “Not that I’m aware of.” Like most consumers, she finds little time to shop, and when she does, she’s on the hunt for “cute stuff that isn’ttoo expensive.” By her own admission, green just isn’t yet on her mind. But –thanks tothe combined efforts of designers, retailers and suppliers –one day it will be.57. What is said about FutureFashion?A) It inspired many leading designers to start going green.B) It showed that designers using organic fabrics would go far.C) It served as an example of how fashion shows should be organized.D) It convinced the public that fashionable clothes should be made durable.58. According to Scott Hahn, one big challenge to designers who will go organic is that.A) much more time is needed to finish a dress using sustainable materials .B) they have to create new brands for clothes made of organic materials .C) customers have difficulty telling organic from non-organic materials .D) quality organic replacements for synthetics are not readily available .59. We learn from Paragraph 3 that designers who undertake green fashion .A) can attend various trade shows free .B) are readily recognized by the fashion worldC) can buy organic cotton at favorable prices .D) are gaining more and more support .60. What is Natalie Hormilla’s attitude toward ecofashion?A) She doesn’t seem to care about it. C) She is doubtful of its practical value.B) She doesn’t think it is sustainable D) She is very much opposed to the idea61. What does the author think of green fashion?A) Green products will soon go mainstream.B) It has a very promising future.C) Consumers have the final say.D) It will appeal more to young people.Passage TwoQuestions 62 to 66 are based on the following passage.Scientists have devised a way to determine roughly where a person has lived using a strand(缕) of hair , a technique that could help track the movements of criminal suspects or unidentified murder victims .The method relies on measuring how chemical variations in drinking water show up in people’s hair.“You’re what you eat and drink, and that’s recorded in you hair,” said Thure Cerling, a geologist at the University of Utah.While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as raid clouds move.Most hydrogen and oxygen atoms in water are stable , but traces of both elements are also present as heavier isotopes (同位素) . The heaviest raid falls first .As a result, storms that form over the Pacific deliver heavier water to California than to Utah.Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months.Cerling’s team collected tap water samples from 600 cities and constructed a mop of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops.They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems.“It’s not good for pinpointing (精确定位),” Cerling said . “It’s good for eliminating many possibilities.”Todd Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake.The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair.When Park heard about the research, he gave the hair samples to the researchers. Chemical testing showed that over the two years before her death, she moved about every two months.She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming.“It’s still a substantial area,” Park said “But it narrows it way down for me.”62. What is the scientists’ new discovery?A) One’s hair growth has to do with the amount of water they drink.B) A person’s hair may reveal where they have lived.C) Hair analysis accurately identifies criminal suspects.D) The chemical composition of hair varies from person to person.63. What does the author mean by “You’re what you eat and drink” (Line 1, Para.3)?A) Food and drink affect one’s personality development.B) Food and drink preferences vary with individuals.C) Food and drink leave traces in one’s body tissues.D) Food and drink are indispensable to one’s existence.64. What is said about the rainfall in America’s West?A) There is much more rainfall in California than in Utah.B) The water it delivers becomes lighter when it moves inland.C) Its chemical composition is less stable than in other areas.D) It gathers more light isotopes as it moves eastward.65. What did Cerling’s team produce in their research?A) A map showing the regional differences of tap water.B) A collection of hair samples from various barber shops.C) A method to measure the amount of water in human hair.D) A chart illustrating the movement of the rain system.66. What is the practical value of Cerling’s research?A) It helps analyze the quality of water in different regions.B) It helps the police determine where a crime is committed.C) It helps the police narrow down possibilities in detective work.D) It helps identify the drinking habits of the person under investigation.Part V Cloze (15 minutes)Kimiyuki Suda should be a perfect customer for Japan’s car-makers. He’s a young, successful executive at an Internet-services company in Tokyo and has plenty of disposable 67 . He used to own Toyota’s Hilux Surf, a sport utility vehicle. But now he uses 68 subways and grains . “It’s not inconvenient at all ,” he says 69 , “having a car is so 20th century.”Suda reflects a worrisome 70 in Japan; the automobile is losing its emotional appeal, 71 among the young ,who prefer to spend their money on the latest electronic devices. 72 mini-cars and luxury foreign brands are still popular ,everything in between is 73 .Last years sales fell 6.7 percent, 7.6 percent 74 you don’t count the mini-car market . There have been 75 one-year drops in other nations :sales in Germany fell 9 percent in 2007 76 a tax increase . But experts say Japan is77 in that sales have been decreasing steadily78 time. Since 1990, yearly new-car sales have fallen from 7.8 million to 5.4 million units in 2007.67. A) profit C) incomeB) payment D) budget68. A) mostly C) occasionallyB) partially D) rarely69. A) Therefore C) OtherwiseB) Besides D) Consequently70. A) drift C) currentB) tide D) trend71. A) remarkably C) speciallyB) essentially D )particularly72. A) While C) WhenB) Because D) Since73. A) surging C) slippingB) stretching D) shaking74. A) unless C) asB) if D) after75. A) lower C) broaderB) slighter D) larger76. A) liable to C) thanks toB) in terms of D) in view of77. A) unique C) mysteriousB) similar D) strange78. A) over C) onB) against D) behindAlarmed by this state of 79 , the Japan Automobile Manufacturers Association (JAMA) 80 a comprehensive study of the market in 2006. It found that a 81 wealth gap, demographic(人口结构的) changes and 82 lack of interest in cars led Japanese to hold their83 longer , replace their cars with smaller ones84 give up car ownership altogether .JAMA85 a further sales decline of 1.2 percent this year. Some experts believe that if the trend continues for much longer , further consolidation (合并) in the automotive sector is86 .79. A) mess C) growthB) boom D) decay80. A) proceeded C) launchedB)relieved D) revised81. A) quickening C) strengtheningB) widening D) lengthening82. A) average C) abundantB) massive D) general83. A) labels C) vehiclesB) cycles D) devices84. A) or C) butB) until D) then85. A) concludes C) reckonsB) predicts D) prescribes86. A) distant C) temporaryB) likely D) immediate。
2023年湖南长沙中考语文全真模拟卷4
2023年湖南长沙中考语文全真模拟卷4（本卷满分120分，考试时间为150分钟。
）一、积累与运用（共18分）1．下面是某同学根据语文书做的字音字形分类笔记，其中有错误的一项是（）（2分）A．注意因多音字造成的误读，如：“拮据（jū）”不能读成“拮据（jù）”，“勾（gòu）当”不能读成“勾（gōu）当”，“冠（guān）冕”不能读成“冠（guàn）冕”。
B．注意因方言中前后鼻音发音造成的误读，如：“灰烬（jìng）”应读成“灰烬（jìn）”，“伶（lín）俐”应读成“伶（líng）俐”，“发怔（zhèn）”应读成“发怔（zhèng）”。
C．注意形似造成的误写，如：“亵渎”不能写成“亵读”，“羡慕”不能写成“羡幕”，“作楫”不能写成“作揖”。
D．注意成语字形的误写，如：“前扑后继”应写成“前仆后继”，“自残形秽”应写成“自惭形秽”，“自吹自雷”应写成“自吹自擂”。
【答案】C【详解】考查多音字及音近形近字的读音、字形。
C.有误，“作揖”是正确的写法；故选C。
2．下面加点词使用不恰当的一项是（）（2分）如今的时代，读屏、听读和读书三种阅读方式并存，“相得益彰．．．．”共同构成了多元化的阅读时代。
所谓阅读，不一定限制于某种方式，能做到随时随地阅读，是不断提升自我的不．二法门．．．。
但是，即便如此，阅读依旧没有做到全民普及化。
在如今的青少年群体中，阅读的匮乏已经到了间不容发．．．．的地步，这个问题必须引起重视，否则，提升国民文化素养，将成为可望不可及．．．．．的事。
A．相得益彰B．不二法门C．间不容发D．可望不可及【答案】A【详解】本题考查词语的运用。
A.相得益彰：两者互相配合或映衬，双方的长处和作用更能显示出来。
句中指的是“读屏、听读和读书三种阅读方式”，不是两者，所以该成语使用有误；B.不二法门：意思是说，观察事物的道理，要离开相对的两个极端而用“处中”的看法，才能得其实在。
西方经济学(一)模拟试卷四答案
《西方经济学（一）》模拟试卷四一、【判断题】（本大题共10小题，每小题1分，共10分）。
1、无差异曲线的斜率是根据两种商品的价格的变化而变化的。
（×）2、预算线的平移说明消费者收入发生变化，价格没有发生变化。
（×）3、收入的分配越平均，洛伦茨曲线的弯曲程度越小。
（√）4、国民收入的总量越大，社会福利的总量越大，这是旧福利经济学的观点。
（×）5、在一定条件下，增加公共产品消费者的人数并不需要减少其他消费品的生产。
（√）6、垄断厂商不必象垄断竞争厂商那样采用广告战略，因为前者没有竞争对手。
（√）7、如果价格和总收益呈同方向变化，则需求是富有弹性的。
（×）8、企业用自有资金进行生产，所以说是没有资金成本的。
（×）9、对需求富有弹性的商品，提高价格可以获得更多的总收益。
（×）10、厂商对生产要素的需求取决于生产要素的边际收益产量。
（×）二、【单项选择题】（本大题共20小题，每小题1分，共20分）。
11、经济学研究的基本问题是（ D ）。
[A]如何在股市上赚钱[B]证明市场可以配置资源[C]选择最公平的收入分配方式[D]稀缺资源的配置与利用问题12、如果商品A和商品B是替代的，则A的价格下降将造成（ D ）。
[A]A的需求曲线向右移动[B]A的需求曲线向左移动[C]B的需求曲线向右移动[D]B的需求曲线向左移动13、如果需求完全无弹性，课税将（ C ）。
[A]全部向销售者征收[B]大部分向销售者征收[C]全部向消费者征收[D]大部分向消费者征收14、已知X商品的价格为5元，Y商品的价格为2元，如果消费者从这两种商品的消费中得到最大效用时，商品Y的边际效用为30，那么此时X商品的边际效用为（ D ）。
[A]60 [B]45 [C]150 [D]7515、边际技术替代率等于（ B ）。
[A]商品价格之比[B]投入要素价格之比[C]边际产量之比[D]边际成本之比16、已知在等产量曲线的某一点上，以生产要素L替代K的边际替代率是2，这意味着（ A ）。
山东专升本(英语)模拟试卷4(题后含答案及解析)
山东专升本（英语）模拟试卷4(题后含答案及解析)题型有：1. V ocabulary and Structure 2. Reading Comprehension 5. Translation 6. WritingV ocabulary and Structure1．—Is this raincoat yours? —No, mine______there behind the door.A．hangB．has hungC．is hangingD．is hanged正确答案：C解析：——这件雨衣是你的吗?——不，我的挂在门后呢。
考点：动词hang 的用法。
根据对话看是“此时此地”，所以用进行时。
A主谓数不一致，D中hanged 意思为“绞死”。
2．He is too weak to______the heavy box.A．riseB．ariseC．raiseD．arouse正确答案：C解析：他太虚弱了，以至于抬不动这个重箱子。
考点：动词及物性和动宾搭配。
A和B都是不及物动词，D是“引发、引起”之意。
3．She______down in bed and soon fell asleep.A．liedB．layC．laidD．lain正确答案：B解析：她躺在床上很快睡着了。
考点：易混淆单词的区别。
A为lie(撒谎)的过去式，C为lay(放置、产卵)的过去式，D为动词lay的过去分词。
4．______is power is a famous saying known to all.A．What knowledgeB．How knowledgeC．Where knowledgeD．That knowledge正确答案：D解析：“知识就是力量”是众所周知的名言。
考点：主语从句引导词。
根据题干后半部分知道前半部分应为一个客观陈述，所以选不作任何具体成分只起引导作用的that。
5．There are nine planets in the solar system, ______are larger than our Earth.A．some of themB．some of whomC．some of thatD．some of which正确答案：D解析：太阳系中有九颗行星，有的比我们地球大。
古代汉语模拟试卷答案4
《古代汉语》模拟试卷四考试形式：闭卷考试时间：90分钟站点：_________ 姓名：_________ 学号：___________ 成绩：_________ 一、选择题（共20分）（以下每小题所列四个选项中只有一项是符合题目要求的。
请将正确选项的序号填入题后的括号里）1、下列各组字，都是形声字的一组是……………………（A ）A、條休倏修B、福视祭祈C、脾腾肺炙D、颖颍顿颈2、下列各组字属于异体字的一组是………………………（D ）A 矜——鳏B 歌——謌C 雕——彫D 距——拒3、下列各组字属于通假字的一组是………………………（C ）A 信——伸B 遁——遯C 说——悦D 村——邨4、下列句子，具有动词用作使动用法的一句是…………（C ）A 人不难以死免其君，我戮之不祥。
B 夫列子御风而行，泠然善也。
C 故远人不服，则修文德以来之。
D 孔子登东山而小鲁，登泰山而小天下。
5、下列句子，属于疑问代词做宾语而前置的一句是……（B ）A 姜氏何厌之有？B 敢问何谓也？C 夫执舆者为谁？D 四体不勤，五谷不分，孰为夫子？6、下列句子，属于双宾语句的一句是……………………（C ）A 是故以天下与人易，为天下得人难。
B 寡君使群臣为鲁卫请。
C 君子疾夫舍曰欲之而必为之辞。
D 盍各言尔志？7、下列句子，属于被动句式的一句是……………………（C ）A 蔓草犹不可除，况君之宠弟乎。
B 尧以不得舜为己忧，舜以不得禹为己忧。
C 治于人者食人，治人者食于人。
D 今不取，后世必为子孙忧。
8、下列句子为判断句的一句是……………………………（B ）A 知之为知之，不知为不知。
B 是非君子之言也。
C 如今人方为刀俎，我为鱼肉。
D 四体不勤，五谷不分，孰为夫子？9、下列句中，不属于被动句的一句是………………………（A ）A 象有齿以焚其身。
B 卻克伤于矢，流血及屦。
C 吾闻用夏变夷者，未闻变于夷者也。
D 子倍子之师而学之，亦异于曾子矣。
国家公务员行测数量关系(数字推理)模拟试卷4(题后含答案及解析)
国家公务员行测数量关系（数字推理）模拟试卷4(题后含答案及解析)全部题型 4. 数量关系数量关系数字推理给你一个数列，但其中缺少一项，要求你仔细观察数列的排列规律，然后从四个供选择的选项中选择你认为最合理的一项，来填补空缺项，使之符合原数列的排列规律。
1．1，2，5，13，( )，89，233，610A．23B．34C．45D．56正确答案：B解析：第二项×3一第一项=第三项。
13×3—5=(34)。
知识模块：数字推理2．4，10，28，76，208，( )A．342B．428C．536D．568正确答案：D解析：前两项之和乘以2等于第三项。
(76+208)×2=568。
知识模块：数字推理3．一1，13，-19，97，( )A．一121B．一211C．一232D．一253正确答案：B解析：第一项×6一第二项=第三项。
(一19)×6—97=(一211)。
知识模块：数字推理4．一1，2，6，21，43，( )A．56B．68C．74D．82正确答案：D解析：和数列变式。
知识模块：数字推理5．3，4，12，1 8，44，( )A．44B．56C．78D．79正确答案：C解析：和数列变式。
知识模块：数字推理6．7，8，8，10，1 1，，( )A．12B．13C．14D．16正确答案：C解析：和数列变式。
知识模块：数字推理7．1，1，3，4，7，( )A．7B．8C．9D．11正确答案：C解析：和数列变式。
知识模块：数字推理8．3，5，9，16，28，( )A．38B．48C．59D．71正确答案：B解析：和数列变式。
前两项和加自然数列得到下一项。
(3+5)+1=9，(5+9)+2=16，(9+16)+3=28，(16+28)+4=(48)。
知识模块：数字推理9．1，2，2，4，( )，32A．6B．8C．16D．24正确答案：B解析：积数列。
第一项×第二项=第三项，依此类推，4×(8)=32。
汽车维修工四级模拟试卷四答案
模拟试卷四一、判断题1、为了用简单明了的图形表示复杂的电气回路，一般使用符合表示构成回路的元件。
（√）2、齐纳二极管是一种特殊的二极管。
（√）3、晶体管的作用就是开关作用。
（×）4、蓄电池的作用就是提供电能。
（×）5、蓄电池充放电就是将化学能转化为电能、电能转化为化学能的过程。
（√）6、蓄电池有低速放电和高速放电特性。
（√）7、提高着火性能的方法就是电极采用贵金属。
（×）8、电压调节器就是保持发电机输出电压的稳定。
（√）9、起动机是直流马达。
（×）10、照明系统的功能就是照明。
（×）11、无触点点火提高了发动机的转速。
（√）12、二级维护前发动机的检测诊断项目是点火系统。
（×）13、汽油发动机和柴油发动机的气缸压力表是一样的。
（×）14、二级维护车辆的尾气排放要符合排放标准。
（√）15、对传动系统进行不解体检测来确定附加作业项目。
（√）16、离合器的工作状况要求不打滑、不抖动、分离彻底、无异响。
（√）17、对蓄电池的电解液要进行比重测量。
（√）18、起动机带动发动机运转，运转轻快但不能发动，是起动困难的现象之一。
（√）19、曲柄连杆机构所受到的力仅有气体的作用力和惯性力。
（×）20、为了使气缸套与缸体之间密封，不论是干式还是湿式气缸套，在压入气缸体以后都应使气缸套顶面与气缸体上平面平齐。
（×）21、气门座圈与气门座孔之间一般采用过渡配合。
（×）22、汽油在气缸内燃烧前必须把汽油喷散成雾状，然后自燃。
（×）23、现代汽油发动机采用电动汽油泵。
（√）24、电动燃油泵不工作说明燃油泵损坏。
（×）25、混合气浓度由喷油嘴决定。
（×）26、现代车辆已取消了曲轴箱通风阀（PCV）。
（×）27、水泵叶轮与水泵轴一般被做成一体。
（√）28、散热器实际上是热交换器。
（√）29、电磁风扇离合器根据发动机的温度自动控制风扇转速（√）。
电力电子模拟试卷四(附答案)
电力电子模拟试卷四(附答案）一、填空题：(本题共5小题，每空1分,共20分）1、由波形系数可知,晶闸管在额定情况下的有效值电流为I Tn等于倍I T(AV）,如果I T=100安培,则它允许的有效电流为安培.通常在选择晶闸管时还要（AV）留出倍的裕量。
2、三相桥式全控整流电路是由一组共极三只晶闸管和一组共极的三只晶闸管串联后构成的，晶闸管的换相是在同一组内的元件进行的.每隔换一次相,在电流连续时每只晶闸管导通度。
要使电路工作正常，必须任何时刻要有只晶闸管同时导通，一个是共极的,另一个是共极的元件，且要求不是的两个元件.3、为了减小变流电路的开、关损耗，通常让元件工作在软开关状态，软开关电路种类很多,但归纳起来可分为与两大类。
4、提高变流置的功率因数的常用方法有、、、几种。
5、三相半波可控整流电路电阻性负载时，电路的移相范围,三相全控桥电阻性负载时，电路的移相范围,三相半控桥电阻性负载时,电路的移相范围.二、判断题：（本题共10小题,每题1分，共10分）1、双向晶闸管的额定电流的定义与普通晶闸管不一样，双向晶闸管的额定电流是用电流有效值来表示的。
（）2、逆变器采用负载换流方式实现换流时，负载谐振回路不一定要呈电容性。
（）3、无源逆变指的是把直流电能转换成交流电能送给交流电网。
（）4、对三相桥式全控整流电路的晶闸管进行触发时,只有采用双窄脉冲触发，电路才能正常工作。
( ）5、PWM脉宽调制型逆变电路中，采用不可控整流电源供电，也能正常工作。
（）6、在变流装置系统中,增加电源的相数也可以提高电网的功率因数. （）7、过快的晶闸管阳极du/dt会使误导通.(）8、电流可逆斩波电路可实现直流电动机的四象限运行。
(）9、为避免三次谐波注入电网，晶闸管整流电路中的整流变压器应采用Y/Y接法（)10、在DC/DC变换电路中，可以采用电网换流方法。
(）三、选择题：（本题共10小题，每题1分，共10分）1、三相全控桥式整流电路带电阻负载，当触发角α=0º时，输出的负载电压平均值为（）。
全国自考(中国古代文学作品选二)模拟试卷4(题后含答案及解析)
全国自考（中国古代文学作品选二）模拟试卷4(题后含答案及解析) 题型有：1. 单项选择题 2. 多项选择题 4. 简答题 5. 论述题 6. 阅读理解单项选择题1．“张三影”指宋代词人( )A．张先B．张炎C．张孝祥D．张元?正确答案：A2．《苏幕遮》(碧云天)中化用江淹《别赋》句意的是( )A．碧云天，黄叶地B．芳草无情，更在斜阳外C．黯乡魂，追旅思D．酒入愁肠，化作相思泪正确答案：C解析：C项化用江淹《别赋》“黯然销魂者，唯别而已矣”句意，点出离别词旨。
3．《正气歌》的作者是( )A．张元?B．苏轼C．文天祥D．范成大正确答案：C4．从体裁上看，苏轼的《荔枝叹》一诗属于( )A．七言律诗B．七言古诗C．七言绝句D．七言歌行体正确答案：B5．下列词句中用了象征这一表现手法的是( )A．雾失楼台，月迷津渡，桃源望断无寻处B．乱石崩云，惊涛裂岸，卷起千堆雪C．至今商女，时时犹唱，《后庭》遗曲D．可堪孤馆闭春寒，杜鹃声里斜阳暮正确答案：A解析：A项中词句选自秦观《踏莎行》，“雾失楼台，月迷津渡”似写夜景，但与后面日暮时间不合，实非眼前之景，连同后面“桃源望断无寻处”，应是象征一种美好理想的消失，有前途渺茫之意。
6．“应念岭海经年，孤光自照，肝胆皆冰雪”是谁的词句( )A．张元?B．辛弃疾C．刘克庄D．张孝祥正确答案：D7．《简斋集》的作者是( )A．陈亮B．贺铸C．黄庭坚D．陈与义正确答案：D8．范成大的号是( )A．石湖居士B．白石道人C．清真居士D．易安居士正确答案：A解析：白石道人为姜袭的号，清真居士为周邦彦的号，易安居士为李清照的号。
9．下列辛弃疾词作中，哪一首被梁启超评为“自怜幽独，伤心人别有怀抱”( )A．《摸鱼儿》(更能消、几番风雨)B．《贺新郎》(老大那堪说)C．《青玉案》(东风夜放花千树)D．《沁园春》(叠嶂西驰)正确答案：C10．《东山词》是谁的词集( )A．张先B．贺铸C．王沂孙D．吴文英正确答案：B解析：张先的词集为《张子野词》，贺铸的词集为《东山词》，王沂孙的词集为《花外集》，吴文英的词集为《梦窗词》。