练习7-10
寒假练习7-十字交叉法
寒假练习7-十字交叉法对于二元混合物,如果用C 表示己知的两个量C 1、C 2的平均值,n 1、n 2表示C 1、C 2对应的份数,则有:C 1 n 1 + C 2 n 2 = C (n 1 + n 2) = C n 1 + C n 2n 1(C 1 - C ) = n 2 ( C - C 2 ) ,根据这个关系可以写成十字交叉图式:(斜看差数,横看结果) 这种运算方法叫十字交叉法。
在运算时,C 必须是已知量或可间接求得的量。
通过十字交叉法可求得C 1与C 2间的物质的量之比。
经典题:例题1 :(1999年全国高考)原计划实现全球卫星通讯需发射77颗卫星,这与铱(Ir)元素的原子核外电子数恰好相等,因此称为“铱星计划”。
(1)已知铱的一种同位素是19177Ir,则其核内的中子数是 ( ) A .77 B .114 C .191 D .268(2)已知自然界中铱有两种质量数分别为191和193的同位素,而铱的平均原子量为192.22,这两种同位素的原子个数比应为 ( )A .39︰61B .61︰39C .1︰1D .39︰11方法:(1)可利用“质量数=质子数+中子数”求解,(2)利用“十字交叉”求解。
捷径:(1)根据“质量数=质子数+中子数”知:中子数=191-77=114。
选B 。
(1) 利用“十字交叉”可得:以此19177Ir 与19377Ir 两种同位素的原子个数比为:0.78︰1.22=39︰61,得答案为A 。
总结: 该题在当年高考中为两条选择题。
若能巧用“十字交叉”,便能迅速获解。
例题2 :(1999年上海高考)由CO 2、H 2、和CO 组成的混合气在同温同压下与氮气的密度相同。
则该混合气中CO 2、H 2、和CO 的体积比为 ( )A .29︰8︰13B .22︰1︰14C .13︰8︰29D .26︰16︰57 方法:将题中三种气体的式量与氮气的式量作比较,找出其间的联系,然后用“十字交叉”求解。
八年级英语下册第7-10单元练习题及答案
姓名:命题:史志勇编审:姚晓玲一、单项选择:20分( )1. – Would you mind ____ down the music? It’s too noisy. - _______.A. to turn, Yes, I wouldB. turning, Yes, I wouldC. to turn, No, I don’tD. turning, No, not at all( )2. I can’t stand him _____ talking. A. keeps B. keeping C. to keep D. kept ( )3. It is polite to wait _____ in public.A. in the lineB. in a lineC. in lineD. in one line( )4. Tom got _____ when he saw the _____ book.A. annoy, annoyedB. annoying, annoyC. annoyed, annoyingD. annoying, annoyed ( )5. The work is ____. You can finish it by yourself.A. easy enoughB. enough easyC. difficult enoughD. enough difficult ( )6. How about _____ stamps?A. collectB. to collectC. collectingD. for collecting( )7. They’ll play basketball _____ watch TV.A. insteadB. instead ofC. rather thanD. rather( )8. – Your watch is so beautiful. It must be expensive. –Not at all. I only ____ $4 on it.A. costB. spentC. paidD. took( )9. –Why not ____ her a doll? - _____ too boring.A. getting, That’sB. get, That’sC. getting, They’reD. get, They’re( )10. This chair is _____ heavy for the little girl _____ carry.A. too, toB. very, toC. so, thatD. very, that( )11. Helen loves to talk about travel. She _____ many places.A. has gone toB. has been toC. has gone forD. has been from( )12. – What day is it today, Monday or Tuesday? - ______. It’s Thursday.A. EitherB. NoneC. NeitherD. Both( )13. –Have you ____ heard of the story? - No, ______.A. already, neverB. ever, everC. never, everD. ever, never( )14. –How long ____ your grandpa _____? - Since six years ago.A. was, deadB. has, diedC. was, diedD. has, been dead( )15. ____ fact, I don’t like art at all. A. At B. In C. On D. To( )16. Linda has ____ been to Disneyland, has she? A. never B. ever C. already D. even ( )17. The boy had a hard time _____ the movie.A. understandsB. understandingC. understandD. to understand ( )18. –I hope it’s a fine day tomorrow. - ______. I want to go camping.A. I hope soB. I don’t hope soC. I hope notD. I hope to( )19. Thanks for the tickets _____ the next week’s game. You are really friendly ____ me.A. of, withB. to, withC. for, toD. with, to( )20. Be careful _____ the street. A. crossing B. cross C. across D. to cross 二、完型填空:10分John was ten years old, but he was still 21 Grade One. He liked 22 and didn’t work hard 23 his lessons. His parents always wanted him 24 a good boy. This afternoon John 25 back, he was very happy. He said to his parents. “Today our teacher praised(表扬) 26 .” Of course his parents were happy, too. They said, “Tell us about it.”“27 class she asked Tom 28 easier question, but he couldn’t answer. And I answered it at once.”“What question”? “How much is one 29 one?”“What did your teacher praised you?” asked his parents.She said to Tom “You’re the most foolish(愚蠢)student in our class and John is 30 than you.”( )21. A. at B. on C. in D. with( )22. A. playing B. to play C. play D. is playing( )23. A. in B. at C. for D. with( )24. A. to be B. be C. become D. is( )25. A. come B. are coming C. comes D. came( )26. A. I B. my C. me D. mine( )27. A. At B. In C. On D. For( )28. A. a B. an C. the D. \( )29. A. to B. and C. for D. with( )30. A. good B. the best C. best D. better三、阅读理解:40分A.Long, long ago there was no zero. To write the number sixty-three people wrote 63. To write six hundred and three, people wrote 6 3. The space between six and three was there to mean. “not any”tens. Sometimes people did not remember the space. It was hard to see and read.Later people used a dot to hold the space. Six hundred and three looked like this 6.3. But the dot was hard to see. So people put a circle around it like this 6⊙3. Then people could see the dot. They remembered the space. At last, only the circle around the dot was used. It was like a zero. This is one story of how the zero came to be used.Now zero has many important uses. Zero tells how many. Can you tell some other ways of using zero?( )31. Long, long ago people didn’t know how to _______.A. writeB. write zeroC. write numbersD. sixty-three ( )32. Long, long ago if they wrote two hundred and eight, people wrote _______.A. 28B. 2 8C. 228D. 208( )33. Later _______ was used to mean space.A. not anyB. letter “O”C. zeroD. a dot ( )34. People used circles ______.A. to remember waysB. to remember numbersC. not to forget the spaceD. to mean nothing ( )35. The story tells us ______.A. how zero came to be usedB. how to write zeroC. what’s the use of zeroD. that zero means a dot, a circle or spaceB.Are you looking for something fun and would you like to help others in your spare time? Then join us to be a volunteer!(自愿者) We’re a non-profit(赢利的) organization. We have volunteer jobs of all ages. Anyone, from twelve-year-old children to people in their seventies can become a volunteers.You can help people in many ways. Schools need help with taking care of children while parents are working. Hospitals need volunteers to look after children while their parents are seeing a doctor. Animal lovers can help take care of those dogs and cats without homes. There is something for everyone.“As a volunteer, I don’t want to get anything. Seeing the children’s happy faces, I’m happy, too.”Said Carlos Domingo, an old woman of 62. “I often played computer games in my spare time before. Now I help older people learn how to use computers.” Said another volunteer at the age of 18.If everyone helps out a bit, we’ll have a better world to live in. Interested? Call us 1-800-555-5756 or visit our website: .( )36. When do the volunteers help others?A. In their spare time.B. At weekends.C. On weekdays.D. In the evenings. ( )37. _____ can be a volunteer.A. ChildrenB. Old womenC. Anyone aged 12-70D. Young people( )38. V olunteers want to get _____ when they help others.A. moneyB. computersC. everythingD. nothing( )39. Carlos Domingo does volunteer work with ______.A. animalsB. childrenC. computersD. older people( )40. We can read such a passage ______.A. in a newspaperB. in a storybookC. in a picture bookD. in a textbookC.One day Bob took two of his friends into the mountains. They put up their tents(帐篷) and then rode off to a forest(森林) to see how the trees were growing.In the afternoon when they were about ten kilometers from their camp(营地), it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp?Bob had an idea. The horse! Let the horses take them back! But what would happen if the horses took the road to his house? That would be a trip of thirty-five kilometers in such cold weather!It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them could tell. John looked around. What was that under the tree? It was one of their tents!( )41. John and his two friends went to the forest to ______.A. build their campB. find their way homeC. enjoy the mountains in the snowD. watch the trees in the forest( )42. They could not find their way back because _______.A.there was only one road to their campB.they couldn’t decide which of the two roads led to their tentsC. there were no roads in the mountains at allD. everything was covered by the white snow ( )43. It is clear that they wanted the horses to take them to ______.A. John’s homeB. the campC. the forestD. the mountains( )44. The horses stopped because ______.A. it was getting lateB. they were tired after running for a long wayC. they knew that they had got to the campD. they had seen John’s house( )45. The story happened _______.A. on a cold winter dayB. on a dark snowy eveningC. in a cold camp far from villagesD. at night when nothing could be seenD.A good reader is like a driver very much. He must change his reading speed(速度)to fit(适应)what he is reading and what he is reading for, just as a driver does to fit the road situation(状况).A good reader may read at 1,000WPM(每分钟……词)when he looks for something for a report in the library. But once he finds what he needs, he may slow down to 100 WPM. A good reader may read newspapers and story books at 600 WPM. But he may read his science or math books at 150 WPM. Just as a driver has a wide(广泛的)change of driving speed, so a good reader has a wide change of reading speed.( )46. The writer thinks that a good reader can ______.A.read at 1,000WPMB. read as fast as he canC. spend more time readingD. change the reading speed as he needs( )47. _______ decides the speed of reading.A.How many is reading forB. What he is reading forC. Where he is readingD. When he is reading( )48. A good reader may read fastest _______.A. when he reads newspapers and story booksB. when he reads something most useful to himC.when he is trying to work out a math problemD. when he is trying to find something for his report( )49. The underlined word “once” in the passage means _______.A. one timeB. onlyC. as soon asD. at once( )50. Which is the best title(题目)for this passage?A. The Importance of Having Different Reading SpeedB. The Difference between Driving and ReadingC. The Best Way of Fast ReadingD. A Good Reader and His Reading Speedfavorite 51 . I began to learn English when I was five years old. When I talked with foreigners, I was very 52 .When I was nine years old, I 53 to Bacui School. I studied English very hard. I think the most important thing about learning English is to learn new 54 . If you want to learn English well, you must remember a lot of words. And we should 55 to foreigners to practice our oral English. Another good way to learn English is to go to foreign countries, 56 as Britain, America and Australia. People there speak English as their 57 language. We can also watch English programs or 58 English books.I love English 59 it’s useful and interesting. I will 60 my best to speak English and learn English well in the future.51. _________ 52. ___________ 53. ____________ 54. __________ 55. _________56. _________ 57. ___________ 58. ____________ 59. __________ 60. _________五、句型转换:10分61. You should wait in line.(变同义句) You shouldn’t ________ _______ ________.62. I have been to the zoo twice.(对画线部分提问)______ _______ _______ have you been to the zoo?63. 我有一个八岁的女儿。
苏教版二年级数学上册第10周应用题7-10
姓名:________ 家长签字:__________1、有32块月饼。
每盒装6块,用5个盒子够装吗?列式:______________()够□不够□2、王老师买来14支铅笔。
平均分给6个小朋友,如果每个小朋友分2支,一共分掉多少支?还剩多少支?列式:______________()列式:______________()3、一支钢笔的钱可以买6块橡皮,妈妈带的钱正好买4支钢笔,如果买橡皮,可以买多少块?如果每块橡皮2元钱,每支钢笔多少钱?列式:______________()列式:______________()4、21个苹果,吃掉一些后还剩下3个,吃掉多少个苹果?列式:______________()5、42个列式:______________()6、小丽写了2行汉字,一共21个。
第一行有7个字,第二行有多少个字?列式:______________()7、学校两边的红旗、绿旗、蓝旗数量一样多,一共有21面,绿旗有多少面?列式:______________()姓名:________ 家长签字:__________8、每个小朋友发6本练习本,42本可以发给多少个小朋友?列式:______________()9、鸭有14只,鹅的只数和鸭同样多。
鸭和鹅一共有多少只?列式:______________()10、有36个月饼,6个小朋友,每人吃5个,吃了多少个?还剩多少个?列式:______________()列式:______________()11、一包饼干6元,买一块蛋糕的钱可以买3包饼干,一块蛋糕多少钱?列式:______________()12、一本书有28页。
(1)小红几天能看完?□○□=□()(2)小明每天看多少页?□○□=□()13、小华说:“我有4本练习本。
”小红说:“我有6本练习本。
”他们一共有多少本练习本?列式:______________()14、买来一些面包,7个小朋友,每个小朋友吃2个,吃了多少个?吃了之后还剩下2个,一共买来多少个面包?列式:______________()列式:______________()姓名:________ 家长签字:__________15、16、买一顶帽子的钱,可以买几双袜子?17、美术组有35人,英语组比美术组少7人,英语组有多少人?列式:______________( )18、把浇30朵花的任务交给小东和他的4个同学,平均每人浇几朵花? 列式:_______________( )19、一把直尺的钱可以买2块橡皮,7把直尺的钱可以买多少块橡皮?列式:______________( )20、一根长35米的绳子,用去7米,还剩多少米?列式:______________( )21、学校原来有30个羽毛球,又买来4盒,每盒6个。
7~10岁体适能训练内容
7~10岁体适能训练内容在儿童成长过程中,体适能的训练对于他们的身体发育和整体健康至关重要。
针对7到10岁儿童的体适能训练内容设计是非常重要的,它不仅可以促进儿童身体各方面素质的发展,还能够培养他们的运动兴趣和能力。
以下是针对7~10岁儿童的体适能训练内容。
1. 有氧运动有氧运动是指持续性的、中低强度的运动,能够增强心肺功能和耐力。
对于7~10岁的儿童来说,适宜的有氧运动包括慢跑、游泳、骑自行车等。
每周至少安排3次有氧运动,每次30分钟左右,逐渐增加运动时间和强度,让孩子在运动中享受乐趣。
2. 肌肉力量训练肌肉力量训练可以改善儿童的体力素质和肌肉力量,促进身体的健康发育。
针对7~10岁儿童的肌肉力量训练可以采用引体向上、仰卧起坐、平板支撑等简单的动作,每周进行2-3次,每次15-20分钟,控制训练的强度和次数,避免用力过猛造成伤害。
3. 灵敏性训练灵敏性是指身体在快速运动时的反应速度和协调能力。
灵敏性训练可以通过跳绳、抓球、踢球等方式进行,训练时注重动作的准确性和速度,提高儿童的反应能力和身体协调性,每周进行2-3次,每次15-20分钟。
4. 柔韧性训练柔韧性训练对于儿童的身体机能和姿势控制具有重要的作用。
通过瑜伽、拉伸操等方式进行柔韧性训练,促进关节的灵活性和肌肉的弹性,每周进行2次,每次15-20分钟,控制动作的幅度和时间,逐渐增加柔韧性的水平。
5. 协调性训练协调性是身体各部分肌肉协同工作的能力,对儿童的运动技能发展至关重要。
通过平衡练习、足球、篮球等项目进行协调性训练,提高儿童的身体控制能力和动作精准度,每周进行2次,每次15-20分钟,逐渐提高训练难度和复杂度。
在进行体适能训练时,家长和教练应该根据儿童的年龄、身体状况和兴趣特点设计合理的训练内容和计划,保证训练的安全和有效性。
同时,鼓励儿童多参与各种体育活动,培养他们的运动兴趣和团队合作能力,共同促进儿童的全面发展和健康成长。
部编版七年级下册语文同步练习7 谁是最可爱的人(含答案)
7谁是最可爱的人知能演练活用夯基达标1.下列词语中加点字的注音全都正确的一项是()A.衔.着(xián)朝鲜.(xiǎn)向隅.(yú) 扛.枪(káng)B.憋.闷(biē) 搏.斗(bó)踹.门(chuǎi) 岱.宗(dài)C.火焰.(yàn) 山冈.(gǎng)接触.(chù) 胸脯.(pú)D.掐.住(qiā) 事迹.(jì)扑.灭(pū) 蹲.守(zūn)2.下列词语中书写有误的一项是()A.放纵覆灭高粱疲劳B.谦逊蜂拥掩埋偷袭C.阻击潮湿脸膛烧毁D.汹涌资势梨耙蹬腿3.下列各句中加点的成语使用不正确的一项是()A.在抗美援朝战争中曾出现过许多可歌可泣....的人物。
B.被警察追捕的小偷,奋不顾身....地四处逃窜。
C.志愿军战士的事迹在朝鲜早已家喻户晓....了。
D.用生命换来我们今天幸福生活的英雄们永垂不朽....。
4.对下列句子分析不当的一项是()A.你不觉得我们的战士是最可爱的人吗?(运用反问的修辞手法,表明对志愿军战士是否可爱有疑问。
)B.谁是我们最可爱的人呢?我们的战士,我感到他们是最可爱的人。
(运用设问的修辞手法,明确提出“我们的战士”是最可爱的人,呼应文题。
)C.我说“朝鲜半边红,半边黑”,这算什么话呢?(运用借代的修辞手法,表现了志愿军战士崇高的国际主义精神。
)D.他长着一副微黑透红的脸膛儿,高高的个儿,站在那儿,像秋天田野里一株红高粱那样淳朴可爱。
(运用比喻的修辞手法,突出了马玉祥淳朴的气质。
)课内品读阅读下面的文字,完成第5~6题。
①在朝鲜的每一天,我都被一些东西感动着;我的思想感情的潮水,在放纵奔流着;我想把一切东西都告诉给我祖国的朋友们。
但我最急于告诉你们的,是我思想感情的一段重要经历,这就是:我越来越深刻地感觉到谁是我们最可爱的人!②谁是我们最可爱的人呢?我们的战士,我感到他们是最可爱的人。
2022-2023学年人教版物理八年级下册第7-10章力学综合练习题
物理八年级下7-10章力学综合练习题一.选择题(共13小题)1.下列说法正确的是()A.为了把画挂挂平,应调整重垂线,使重垂线与桌面垂直B.底面积相同的容器内装有相同深度的水,则容器底部受到液体压力关系:F A=F B=F CC.高度相同的实心圆柱体甲、乙,两者对地面的压强相等,则圆柱体密度关系:ρ甲≥ρ乙D.在“流体压强与流速的关系”的现象中,压强p1≤p22.如图所示,用大拇指和食指分别用沿竖直方向的力压住一铜圆柱体两端,圆柱体对食指的压力和压强分别为F1和p1,圆柱体对大拇指的压力和压强分别为F2和p2。
则以下说法正确的是()A.F1=F2,p1=p2B.F1<F2,p1<p2C.F1=F2,p1<p2D.F1>F2,p1>p23.如图所示,用F=30N的水平推力推着重为60N的物体沿水平方向做直线运动,若推力F对物体做了90J的功,则在这一过程中()A.物体一定运动了1m B.物体一定运动了3mC.重力做的功一定是60J D.物体一定受到20N的摩擦力4.汽车爬坡时,驾驶员的操作是:加大油门,同时将变速器换成低速挡。
加大油门是使发动机发挥最大的功率,换用低速挡是为了减速。
那么,在爬坡时,减小汽车的速度是为了()A.保证安全B.获取更大的动力C.省油D.增大惯性5.如图所示,甲、乙两容器质量相等、底面积相同,内装两种不同液体,两容器底部受到的液体压强相等,液体质量分别为m甲和m乙,距离容器底部等高的位置有A、B两点,受到的液体压强分别为p A和p B,则()A.m甲>m乙,p A>p B B.m甲=m乙,p A>p BC.m甲=m乙,p A<p B D.m甲<m乙,p A=p B6.如图所示,将8个完全相同的正方体物块,按甲、乙两种方式叠放在水平地面上,则甲、乙两种方式中的物体对地面的压强之比为()A.5:3B.9:10C.5:2D.3:27.均匀正方体甲、乙置于水平地面上,对水平地面的压强分别为p甲、p乙,如图所示。
一次函数提高练习7-10
一次函数提高练习1.当实数x 的取值使得x -2有意义时,函数y =4x +1中y 的取值范围是( ). A .y ≥-7 B .y ≥9 C .y >9 D .y ≤92.一个矩形被直线分成面积为x ,y 的两部分,则y 与x 之间的函数关系只可能是3.将直线y =2x 向右平移1个单位后所得图象对应的函数解析式为( ) A 、y =2x -1 B 、y =2x -2 C 、y =2x +1 D 、y =2x +24.已知一次函数y=﹣x+b 的图象经过第一、二、四象限,则b 的值可以是( ) A 、﹣2B 、﹣1C 、0D 、25. 关于x 的一次函数y=kx+k 2+1的图象可能正确的是( )A 、B 、C 、D 、6.如图,是张老师出门散步时离家的距离与时间之间的函数关系的图象,若用黑点表示张老师家的位置,则张老师散步行走的路线可能是( )7.如图,已知A 点坐标为(5,0),直线y=x +b (b>0)与y 轴交于点B ,连接AB ,∠α=75°,则b 的值为 A.3 B.335 C.4 D.435y x ∙∙ABCDx图38.一次函数 y=(6-3m)x +(2n -4)不经过第三象限,则m 、n 的范围是__________。
9.直线y=(6-3m)x +(2n -4)不经过第三象限,则m 、n 的范围是_________。
10.已知直线y=kx+b 经过第一、二、四象限,那么直线y=-bx+k 经过第_______象限。
11.无论m 为何值,直线y=x+2m 与直线y=-x+4的交点不可能在第______象限。
12.如图所示,在矩形ABCD 中,动点P 从点B 出发,沿BC ,CD ,DA 运动至点A 停止,设点P 运动的路程为x ,△ABP 的面积为y ,如果y 关于x 的函数图象如图10所示,那么△ABC 的面积是 .13.一次函数的图像与y=2x-5平行且与x 轴交于点(-2,0)求解析式。
7~10岁体适能训练计划
7~10岁体适能训练计划简介7至10岁是儿童成长发育的关键阶段,此时期的体能训练对于儿童的身体发育和运动技能的发展非常重要。
合理的体适能训练计划能够帮助儿童建立良好的身体素质,增强体能,提高运动技能,预防运动伤害,培养运动兴趣,为未来健康奠定基础。
体适能训练目标1.提升儿童的肌肉力量,增强核心稳定性。
2.培养并提高儿童的协调性和平衡感。
3.增强心血管系统的耐力和体能。
4.发展儿童的柔韧性和灵活性。
5.提高儿童的速度反应能力和运动技巧。
训练计划安排以下是针对7至10岁儿童设计的体适能训练计划建议。
在实施前,请先进行充分的热身运动和拉伸活动,确保儿童身体良好状态下进行训练。
每周训练频率•每周进行3次体适能训练,间隔1天进行一次锻炼。
•每次训练时间约为30-45分钟,包括热身、核心训练、力量训练、灵活性拉伸等环节。
训练内容1.热身(5分钟):进行简单的跑步、跳绳等全身热身活动,准备身体。
2.核心训练(10分钟):如仰卧起坐、平板支撑等,加强核心力量和稳定性。
3.力量训练(15分钟):使用自身体重或简单器械进行俯卧撑、深蹲、单腿站立等,提升肌肉力量。
4.柔韧性训练(10分钟):进行各种拉伸动作,放松肌肉,提高柔韧性。
5.平衡训练(5分钟):包括单腿站立、平衡板练习等,培养儿童的协调和平衡能力。
注意事项•每项训练动作需要适应儿童的年龄和体能水平,避免过度训练。
•训练过程中保持愉快的氛围,鼓励和关心儿童,让他们享受运动的乐趣。
•注意儿童的安全,确保训练场地和器械的安全性,避免发生意外伤害。
结语体适能训练计划对于7至10岁儿童的身体发育和健康至关重要,通过科学合理的训练安排,可以有效提升儿童的体能水平和运动技能,培养他们积极健康的生活方式。
希望家长和教练能够重视儿童的体适能训练,为他们的健康成长提供坚实的保障。
7--10模块练习
英汉词组互译
• 1.飞入太空 行员 • 3.度过21个小时 • 5.去机场 • 7.握他的手
2.成为一个飞 4..以…自豪 6.在饭店里吃饭 8.回到中国
英汉互译:
• • • • • 1.出生在美国 2.当是一个小孩子 的时候 3聋哑 4画字母 5 全世界 6活到87岁 7盲人 8一所盲人学校 9 make first letters in Braille 10.have a great fall
•
按要求写出下列单词和短语的相应 形式.
• 1 study (过去式)__________ 2 learn(现 在分词)__________ • 3 miss(第三人称单数)__________ 4 Chinese(复数)__________ • 5 wear(过去式)____________ 6 get on(对应词组)_________ • 7 wake(过去式)____________ 8 born (原形)__________ • 9 could not (缩写形式)________ 10 made (原形)___________
词组互译
1.学习物理 2.吹小号 • 3.练习我的英语 4. 围着湖边走 • 5.酒泉发射中心 6.骑自行车去上学 • 7.一个盲人.你我学习的榜样 8.飘走
•
根据要求写出下列单词:
• • • • • 1 have(现在分词) 2 spend(过去式) 3 shine(现在分词) 4 leave(过去式) 5 waiter(对应词) 6 careful(副词) 7 Chinese(复数) 8 inside(反义词) 9 enjoy(过去式) 10 never(反义词)
根据提示,完成句子
• 1 We are going to ____ _____ ________ ________ (去中学)this Sepember. • 2 The film is exciting. I’m _________ ____________(确实激动). • 3 I’m _________ _______ _______ ______________(打算学物理)this term. • 4 Daming is back in China . He ______________ (想念)own motherland. • 5 How am I going________ ___________(练 习)my English now?
2019年中考英语总复习第7课时八上Units7_10练习3
第7课时八年级上册Units 7~10一、单项选择1.(2018·江西吉安二模)—Does David love playing soccer?—Yes. He plays soccer almost every day it rains heavily.A.whether B.if C.unless D.as2.(2018·上海黄浦二模)Don't leave the child alone. He is not old enough to take care of . A.he B.him C.his D.himself3.(2019·预测)Don't waste water. Water is very important and no one can liveit.A.without B.with C.except D.besides4.(2019·原创)Your is very helpful. I guess our teacher will take it.A.secret B.advice C.promise D.purpose5.(2019·原创)—We to visit the Great Wall when Lucy gets back.—That sounds good. I want to go with you.A.went B.goC.have gone D.will go6.(2019·预测)Jane thinks that she is going to be astronaut when she grows up. A.a B.an C.the D./7.(2018·上海奉贤二模)In April, the weather in some places changes a lot. People remember when they have four seasons in one week.A.organized B.describedC.expressed D.experienced8.(2019·原创)I invited Mary to the party. But she my invitation politely. A.took off B.looked downC.turned down D.took in9.(2019·原创)Don't worry. I will support you to run after your dream. A.probably B.wiselyC.certainly D.hardly10.(2019·预测)—Mom, I'm afraid I can't do well in the final exam.—Come on, baby! You should believe in yourself. You won't know what you can doyou try it.A.until B.if C.whether D.although二、阅读理解(2019·预测)Dear Karen,As you probably know, it's my sister Suzie's 16th birthday in a week. We're planning a surprise party for her. Julie is going to pick her up from school as usual on Friday but she's not taking her home. She's bringing her to the Palace Hotel, the big modern one near the station. We're having a meal there and we've also hired(租用) the ballroom(舞厅) for a party in the evening.I hope you can come!All her friends from school are coming and quite a few of the people from our village, too. Of course, Mom and Dad are coming up from England and I've managed to persuade(说服) our other sister, Marie, to come over from Australia. She's bringing her kids with her, too.After the party we're going to have another one on Saturday! Well, not really a party. We're inviting the family and close friends (that includes you) for a meal at the house. If the weather is nice, we'd like to have a barbecue in the garden. Julie is going to make a special cake for Suzie.Anyway, we hope to make it a really special weekend for Suzie. On Sunday we're all going for a walk in the country. You know how she loves walking and we're all going to need a bit of exercise after all that lovely food. We're hoping to go up to the lake. Marie said she wanted her kids to feed the ducks just like what Suzie and she did when they were very young. I'm sure Suzie will love that, too.It would be great if you could come over for the weekend. We would all love to see you.Let me know as soon as you can.Best,David 1.Who is Karen?A.David's cousin. B.David's friend.C.David's sister. D.David's classmate.2.David and Julie are planning to have Suzie's birthday party on Friday evening. A.at the Palace Hotel B.at the houseC.in the garden D.beside the lake3.Which of the following is NOT mentioned?A.To make a special cake. B.To have a barbecue.C.To go swimming. D.To feed the ducks.4. won't come for the meal at the house on Saturday because David doesn't invite them/her.A.Karen B.People from their villageC.Suzie's Mom and Dad D.Marie and her kids5.David is planning a walk in the country on Sunday because he thinks .A.Suzie loves walking very muchB.Suzie used to take a walk there after dinnerC.it is special for Marie's kids to go for a walk in the countryD.Suzie can feed the ducks in the river when going for a walk三、动词填空阅读下面短文,用括号内所给动词的适当形式填空(必要时可加情态动词或助动词)。
排球社团活动记录
重点让学生观察动作的连续性,击球人重心的移动要跟上步法的移动。
活动效果:
排球社团活动记录
活动课题
复习移动;复习传、垫球
参加人员
刘晓萍等
1、移动练习
1提问移动的做法,并找学生示范,让学生讲评2-3人次。然后,教师进行总评;
2将学生分成人数相等的若干组,每组成一路纵队站立在端线外,听信号各组第一人按要求做好准备成领会撑或跪撑,听口令快速起立做移动6-8米4-6次;
1、准备姿势和移动的基本练习,专项准备活动。
2、让学生加深对准备姿势和移动的理解。
3、学习正面下手发球。
找学生口述正面下手发球的理论技术要点
徒手练习:
4、二人一组,轮流抛球做发球练习(8*2)
5、二人一组,相距8-10米,做发球练习;也可做隔网的正面下手发球练习(8-15次。)
活动效果:
排球社团活动记录
在练习中应注意抛球的高度要适中,挥臂路线要清晰,击球时,触球的部位要用力,保持一定的紧张程度,还要注意身体心随之前移。
4、二人一组,轮流抛球做发球练习(8*2)
5、二人一组,在三米线处,做发球练习;也可做隔网的正面下手发球练习(8-15次。)
活动效果:
排球社团活动记录
活动课题
正面下手发球
参加人员
董俊瑜等
活动效果:
排球社团活动记录
活动课题
复习正面下手发球
参加人员
董俊瑜等
。
1、姿势和移动的基本练习。
2、让学生加深对准备姿势和移动的理解。
3、学习正面下手发球。
找学生口述正面下手发球的技术要点
徒手练习:
4、集体做准备姿势和移动听消音做
河南省许昌市市一中九年级英语一轮复习----八年级上册unit7-10知识点和练习
八年级上册unit7-10第一部分:核心知识梳理八年级上Unit 7—Unit 8词汇拓展1.pollute (v.)→(n.)污染;污染物2.environment(n.)→(adj.)自然环境的;生态环境的;有关环境的3.peace (n.)→(adj.)和平的;安宁的4.danger(n.)→(adj.)有危险的;不安全的5.agree(v.)→(n.)同意;意见一致→(v.)不同意;持不同意见;有分歧6.fall (v.)→(过去式)→(过去分词)倒塌;跌倒;掉落7.possible (adj.)→(adv.)可能;或许→(n.)可能;可能性→(adj.)不可能存在或发生的;不可能的8.probable(adj.)→(adv.)很可能;大概9.shake (v.& n.)→(过去式)→(过去分词)摇动;抖动10.final (adj.)→(adv.)最后;最终11.salt (n.)→(adj.)含盐的;咸的12.dig (v.) →(过去式/过去分词)→(现在分词)掘(地);凿(洞);挖(土)13.tradition(n.)→(adj.)传统的;惯例的14.travel(v.& n.)→(n.)漂泊者;旅行者;游客15.celebrate(v.)→(n.)庆典;庆祝活动16.serve(v.)→(n.)接待;服务17.believe(v.)→(adj.)可信的→(n.)相信;信心【词汇拓展】1.pollution2.environmental3.peaceful4.dangerous5.agreement; disagree6.fell; fallen7.possibly; possibility; impossible8.probably9.shook; shaken 10.finally11.salty12.dug; digging 13.traditional14.travel(l)er15.celebration 16.service 17.believable; belief短语归纳1.参与;发挥作用2.space station3.over and over again4.disagree with5.醒来6.许多;大量7.看起来像;与……相似8.突然倒下;跌倒;倒塌9.look fork shake11.接通(电流、煤气、水等);打开12.cut up13.把……倒入……14.取出15.fill...with...16.一片;一块【短语归纳】1.play a part2.太空站;宇宙空间站3.多次;反复地4.不同意5.wake up6.hundreds of7.look like8.fall down9.寻找;寻求10.奶昔11.turn on12.切碎13.pour...into...14.take out 15.用……装满……16.a piece of八年级上Unit 9—Unit 10词汇拓展1.prepare(v.)→(n.)准备;准备工作2.hang(v.)→(过去式/过去分词)悬挂;垂下3.catch(v.)→(过去式/过去分词)及时赶上;接住;抓住4.invite(v.)→(n.)邀请;请柬5.sad(adj.)→(adv.)不幸地;悲伤地→(n.)悲伤;悲痛6.surprise(v.)→(adj.)惊奇的;感觉意外的→(adj.)令人惊奇的;使人吃惊的;惊人的7.open(v.)→(n.)开幕式;落成典礼8.advice(n.)→(v.)劝告;建议9.normal(adj.)→(adv.)通常;正常情况下10.certain(adj.)→(adv.)无疑;肯定;当然;行11.angry(adj.)→(n.)怒;怒火;怒气→(adv.)发怒地;生气地12.understand(v.)→(过去式/过去分词)理解;领会→(adj.)善解人意的;体谅人的【词汇拓展】1.preparation2.hung3.caught4.invitation5.sadly; sadness6.surprised; surprising7.opening8.advise9.normally10.certainly11.anger; angrily12.understood; understanding短语归纳1.prepare for...2.go to the/a doctor3.患流感4.another time5.闲逛;常去某处6.the day before yesterday7.the day after tomorrow8.照顾;照料9.拒绝10.take a trip11.在……末尾12.look forward to13.接到(某人的)信、电话等14.too...to...15.keep...to oneself16.逃避17.分成两半【短语归纳】1.为……做准备2.去看医生3.have the flu4.其他时间;别的时间5.hang out6.前天7.后天8.look after9.turn down10.去旅行11.at the end of12.盼望;期待13.hear from14.太……而不能……15.保守秘密16.run away from17.in half第二部分教材知识点讲解考点一in与after的用法【课文原句】Will people use money in 100 years?100年后人们还会用钱吗?(1)in和after均可与一段时间连用。
七的加减法练习题(打印版)
七的加减法练习题(打印版)### 七的加减法练习题#### 加法练习1. 7 + 0 =2. 7 + 1 =3. 7 + 2 =4. 7 + 3 =5. 7 + 4 =6. 7 + 5 =7. 7 + 6 =8. 7 + 7 =9. 7 + 8 =10. 7 + 9 =#### 减法练习1. 10 - 7 =2. 11 - 7 =3. 12 - 7 =4. 13 - 7 =5. 14 - 7 =6. 15 - 7 =7. 16 - 7 =8. 17 - 7 =9. 18 - 7 =10. 19 - 7 =#### 混合练习1. 7 + 3 - 5 =2. 8 + 7 - 6 =3. 9 - 7 + 4 =4. 6 + 7 - 2 =5. 10 - 7 + 3 =6. 5 + 7 - 9 =7. 4 - 7 + 8 =8. 12 - 7 - 3 =9. 15 - 7 + 6 =10. 7 + 7 - 7 =#### 应用题1. 小明有7个苹果,他给了小华2个,小明现在有几个苹果?2. 小红有10个气球,她给了小刚7个,小红还剩下多少个气球?3. 小强有7支铅笔,他需要买3支,小强现在需要多少支铅笔?4. 小丽有7本书,她借给了朋友4本,小丽现在还有几本书?5. 小华有7张邮票,他收到了5张新的邮票,小华现在有多少张邮票?#### 答案区学生可以在下方空白区域填写答案。
#### 附加提示- 请认真审题,确保理解题目要求。
- 练习时,可以先做简单的题目,再逐步挑战更难的题目。
- 完成后,可以自行检查答案,或请家长和老师帮忙检查。
希望这些练习题能帮助你更好地掌握七的加减法。
祝你学习愉快!。
四边形经典练习7-10
四边形的典型问题1、正方形的对角线长是23cm,则正方形的周长是,面积是.2、菱形两邻角的度数比为1:2,且边长为1,则两对角线的长分别为.3.如图,在□ABCD中,已知AD=8㎝, AB=6㎝,DE平分∠ADC交BC边于点E,则BE等于()A.2cmB.4cmC.6cmD.8cm4.如图,在矩形ABCD中,AB=3,AD=4,点P在AD上,PE⊥AC于E,PF⊥BD于F,则PE+PF 等于()A.B.C.D.5.如图,正方形ABCD内有两条相交线段MN、EF,M、N、E、F分别在边AB、CD、AD、BC上.小明认为:若MN = EF,则MN⊥EF;小亮认为: 若MN⊥EF,则MN = EF.你认为A.仅小明对B.仅小亮对C.两人都对D.两人都不对6.如图,四边形ABCD中,AB=BC,∠ABC=∠CDA=90°,BE⊥AD于点E,且四边形ABCD的面积为8,则BE=()A.2 B.3 C.D.ABCDE75125135145A DCEFP7.矩形的两对角线相交所成的角是60°,则短边与长边之比为( ) (A )1:2 (B )1:2 (C )1:3 (D )1:38.如图1,边长为3的正方形ABCD 绕点C 按顺时针方向旋转30 °后得到正方形EFCG,EF 交AD 于点H,那么DH 的长为________.9.如图,正方形ABCD 的面积为3,点E 是DC 边上一点,DE =1,将线段AE 绕点A 旋转,使点E 落在直线BC 上,落点记为F , 则FC 的长为 .10、如图,矩形ABCD 中,E 为AD 上一点,EF ⊥CE 交AB 于F ,若DE=2,周长是16,且CE=EF.求AE 的长.HGF EDCBAA B C DEFCA BDEF11、菱形两对角线的和是7cm ,菱形的面积是6cm 2,求菱形的周长.12、如图,E 、F 分别在正方形ABCD 的边BC 、CD 上,且∠EAF=45°.求证:EF=BE+DF13.如图,在正方形ABCD 中,点E 、F 分别是BC 、DC 边上的点,且AE EF , (1)延长EF 交正方形外角平分线CP P 于点,试判断AE EP 与的大小关系,并说明理由; (2)在的AB 边上是否存在一点M ,使得四边形DMEP 是平行四边形?若存在,请给予证明;若不存在,请说明理由.ADCBEBCE DAF PFA B CF D E14.如图在矩形ABCD中,BE平分∠ABC,交CD于点E,点F在边BC上,①如果FE⊥AE,求证:FE=AE.②如果FE=AE,你能证明FE⊥AE吗?请证明.15. 阅读下列材料:问题:如图1,在正方形ABCD内有一点P,PA=5,PB=2,PC=1,求∠BPC的度数.小明同学的想法是:已知条件比较分散,可以通过旋转变换将分散的已知条件集中在一起,于是他将△BPC绕点B逆时针旋转90°,得到了△BP′A(如图2),然后连结PP′.请你参考小明同学的思路,解决下列问题:(1) 图2中∠BPC的度数为;(2) 如图3,若在正六边形ABCDEF内有一点P,且PA=132,PB=4,PC=2,则∠BPC的度数为,正六边形ABCDEF的边长为.B16.如图,在□ABCD 中,AB =5,AD =10,BE BF =35,过BC 的中点E 作EF ⊥AB ,垂足为点F ,连结DF ,求DF 的长.17.已知:如图,菱形ABCD 中,过AD 的中点E 作AC 的垂线EF ,交AB 于点M ,交CB 的延长线于点F .如果FB 的长是2,求菱形ABCD 的周长.18.如图,在 ABCD 中,过点B 作BE ∥AC ,在BG 上取点E ,联结DE 交AC 的延长线于点F .(1)求证:DF =EF ;(2)如果AD =2,∠ADC =60°,AC ⊥DC 于点C ,AC =2CF ,求BE的长.FDC B A MFECDA FD CBA EGB C AD E19. 已知:如图,四边形ABCD 中,∠ABC=135°, ∠BCD=120°,BC=5CD=6, 求AD 的长.20.已知:如图,在梯形ABCD 中,AD ∥BC ,∠B=45°,∠BAC=105°,AD =CD =4.求BC 的长.21.如图,在梯形ABCD 中,AD BC ∥,90A ∠=︒,︒=∠45C ,DE=EC ,AB=4,AD=2,求BE 的长.DA B C22.如图,在四边形ABCD 中,AC 平分∠BAD ,10CD BC ==,21AB =,9AD =.求AC 的长.23.已知:如图,在梯形ABCD 中,AD ∥BC ,AB=AD =2,∠A=60°,BC =4,求CD 的长.24.已知:如图,梯形ABCD 中,DC ∥AB ,AD =BC ,对角线AC 、BD 交于点O ,∠COD =60°,若CD =3,AB =8,求梯形ABCD 的高.B CD O A25.请阅读下列材料:问题:如图1,在菱形ABCD 和菱形BEFG 中,点A B E ,,在同一条直线上,P 是线段DF 的中点,连结PG PC ,.若60ABC BEF ∠=∠= ,探究PG 与PC 的位置关系及PGPC的值.小聪同学的思路是:延长GP 交DC 于点H ,构造全等三角形,经过推理使问题得到解决.请你参考小聪同学的思路,探究并解决下列问题:(1)写出上面问题中线段PG 与PC 的位置关系及PGPC的值; (2)将图1中的菱形BEFG 绕点B 顺时针旋转,使菱形BEFG 的对角线BF 恰好与菱形ABCD 的边AB 在同一条直线上,原问题中的其他条件不变(如图2).你在(1)中得到的两个结论是否发生变化?写出你的猜想并加以证明.D A BE F C P G 图1 D C G PA B F图226.在□ABCD 中,∠BAD 的平分线交直线BC 于点E ,交直线DC 于点F .(1)在图1中,证明:CE =CF ; (2)若∠ABC =90°,G 是EF 的中点(如图2),直接写出∠BDG 的度数; (3)若∠ABC =120°,FG ∥CE ,FG =CE ,分别连结DB 、DG (如图3),求∠BDG 的度数.B BADADC C EFE G FABC DE G 图1图2图3。
ISO9001:2015第7章-10章 练习题
ISO9001:2015第7章-10章练习题您的姓名: [填空题] *_________________________________您的电话: [填空题] *_________________________________您的班级 [单选题] *○一班○二班○三班○四班○五班○六班○七班○八班○九班○十班○十一班○十二班1. 以下不是设计和开发过程控制活动的是() [单选题] *A 实施更改活动(正确答案)B 实施评审活动C 实施验证活动D 实施确认2. 依据GB/T19001-2016标准9.1.2条款,以下错误的是() [单选题] *A 组织应监视顾客的需求和期望已得到满足程度的感受B 组织应确定获取顾客的需求和期望已得到满足的感受的程度的信息的方法C 组织应监视顾客关于组织是否满足其要求的感受的相关信息(正确答案)D A+B3. 依据GB/T19001-2016标准“更改控制”的要求,“组织应保留的成文信息不包括() [单选题] *A 更改评审的结果B 授权进行更改的人员C 根据评审所采取的必要措施D 可追溯的信息(正确答案)4. 适用时,组织应采取措施获得所需人员的能力。
采取的适当措施不包括() [单选题] *A 辅导或重新分配工作B 制定岗位能力说明书(正确答案)C 聘用、外包胜任的人员D 在职人员进行培训5. 以下哪些不是顾客财产() [单选题] *A 培训机构在上课前收集到的学员通讯录B 银行向储户索要的身份证复印件C 雨天,就餐者将自带的雨伞放在酒店门口的固定雨伞架上D 涂料公司向顾客提供的标准色卡(正确答案)6. 检验是对符合规定要求的确定。
检验的结果可表明合格、不合格或合格的()。
[单选题] *A 性质B 原因C 分类D 程度(正确答案)7. 对监视和测量资源,以下描述不正确的是()。
[单选题] *A 测量资源应适合特定类型的测量活动B 监视和测量资源应得到适当的维护以确保持续适合其用途C 监视资源应按规定的时间间隔或在使用前进行校准和(或)检定(验证)(正确答案)D 组织应保留作为监视和测量资源适合其用途的证据的形成文件的信息8. GB/T19001标准中表示的“保留形成文件的信息”指的是() [单选题] *A 程序文件B 作业文件C 记录(正确答案)D 图纸9. 组织在确定与其目标和战略方向相关并影响其实现质量管理体系预期结果的各种外部和内部因素时可以不考虑下列哪个因素?()。
ISO45001:2018第7章至第10章 练习题
ISO45001:2018第7章至第10章练习题您的姓名:[填空题] *_________________________________您的电话: [填空题] *_________________________________您的班级: [单选题] *○一班○二班○三班○四班○五班○六班○七班○八班○九班○十班○十一班○十二班1. 对公司的职业健康安全管理体系审核可以不包括() [单选题] *A 公司产品的安全特性(正确答案)B 公司外出业务员的工作活动C 公司职工食堂D 公司借用的设备2. 及时、准确的职业病统计信息是职业健康管理决策的重要依据,最常用的职业病调查统计方法是() [单选题] *A 普查B 典型调查C 抽样调查(正确答案)D 重点调查3. 依据风险管理原理,控制措施的有效性是指() [单选题] *A 对危险源所采取的控制措施将其风险控制在了可接受状态(正确答案)B 对危险源所采取的控制措施将其风险控制在了不可接受状态C 对危险源所采取的控制措施将其风险消除D 对危险源所采取的控制措施将其风险控制在了最低状态4. 应急管理部2号令:《生产安全事故应急预案管理办法》生产经营单位应当制定本单位的应急预案演练计划,根据本单位的事故风险特点,每年至少组织一次综合应急预案演练或者专项应急预案演练和组织()现场处置方案演练。
[单选题] *A 一次B 三次C 二次(正确答案)D 四次5. 依据GB/T45001-2020标准,组织应策划、实施、控制并保持满足职业健康安全管理体系要求以及实施条款()所确定的措施所需的过程 [单选题] *A 6(正确答案)B 6.1.4C 6.2.2D 6.16. GB/T45001-2020标准强调了()的协商和参与。
[单选题] *A 管理者B 工作人员C 非管理类工作人员(正确答案)D 承包方7. 某企业发生了一起火灾事故,事故原因是由于车间新安装的空调机冷凝水导致电气线路短路造成的。
中级消防设施操作员理论练习题(7-10套)
中级消防设施操作员理论练习题(1-10套)中级消防设施操作员理论练习题(七) (2)中级消防设施操作员理论练习题(八) (3)中级消防设施操作员理论练习题(九) (4)中级消防设施操作员理论练习题(十) (6)中级消防设施操作员理论练习题(七)1.消防水箱与生活水箱合用,水箱应储存()分钟消防用水量。
A.7B.8C.9D.10【答案】D2.室内消防系统设置()的作用是使消防车能将室外消火栓的水从接入室内。
A.消防水箱B.消防水泵C.水泵结合器D.消火栓箱【答案】C3.室内消火栓系统的用水量是()。
A.保证着火时建筑内部所有消火栓均能出水B.保证2支水枪同时出水的水量C.保证同时使用水枪数和每支水枪用水量的乘积D.保证.上下三层消火栓用水量【答案】C4.消防管道不能采用的管材是()。
A.无缝钢管B.镀锌钢管C.焊接钢管D.塑料管【答案】D5.()电路用以抗御探测器所处环境中可能受到的各种干扰,并用以减少工作环境对其正常工作的影响,以提高其自身的稳定性。
A.转换B.指示C.抗干扰D.传输【答案】C6.可复位报警按钮使用时,推入报警按钮的玻璃触发报警,火警解除后()。
A.可自动复位B.可用专用工具进行复位C.应更换新的报警按钮D.更换玻璃【答案】B7.对手动火灾报警按钮的外观清洁维护时,下列做法正确的是()。
A.用力擦触玻璃B.用水冲洗C.可用吹风机吹扫手动报警按钮表面。
D.将玻璃卸下进行清洗【答案】CA.自行拆卸加以清洗B.用水冲洗C.用湿布擦拭D.用吹风机吹扫火灾警报装置表面【答案】D9.手动火灾报警按钮按照其触发方式可分为两种:一种是玻璃破碎按钮,另一种是()。
A.可消音报警按钮B.可联动报警按钮C.可复位报警按钮D.可自锁报警按钮【答案】C10.室外消火栓使用完毕后,需打开(),将消火栓内的积水排出,以免结冰将消火栓冻坏。
A.阀瓣B.排水阀C.阀杆D.接口【答案】B中级消防设施操作员理论练习题(八)1.消防控制室是建筑内消防设施系统的()中心。
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1. 2的值( )
A .在1到2之间
B .在2到3之间
C .在3到4之间
D .在4到5之间 2.在0,l ,一2,一3.5这四个数中,是负整数的是( )
A .0
B .1
C .一2 D.一3.5
3.若3)2(⨯-=x ,则x 的倒数是( )A .61- B .61 C .6- D .6
4. 因式分解:9x 2-y 2-4y -4=__________.
5. 分解因式:2ax ax -= .
6. 化简a
a b a b -÷⎪⎭⎫ ⎝⎛-2的结果是 A .1--a B .1+-a C .1+-ab D .b ab +-
7. 4的平方根是( ) A. 2 B. ± 2 C. 16 D. ±16
8.已知⎩
⎨⎧==12y x 是二元一次方程组⎩⎨⎧=-=+18my nx ny mx 的解,则n m -2的算术平方根为 A .4 B .2 C . 2 D . ±2
9. )若01x <<,则1-x 、x 、2x 的大小关系是( )
A .21x x x <<-
B .12-<<x x x
C .12-<<x x x
D .x x x <<-12 10. 若代数式26x x b -+可化为2()1x a --,则b a -的值是 .
练习8
1. 28-的结果是( ) A .6
B .22
C .2
D .2 2. 下列运算中,正确的个数是( )
()323526023215x x x x
x +==⨯-=①,②,③,④538--+=,⑤11
÷=. A .1个 B .2个 C .3个
D .4个 3. 计算: 00145tan )21(4)31
(--++--
4.8的立方根是( )A .2.
B .2-
C .±2
D .5.据《宁波市休闲基地和商务会议基地建设五年行动计划》,预计到2012年,宁波市接待游客容量将达到4640万人,其中4640万用科学记数法可表示为 ( )
A .90.46410⨯
B .84.6410⨯
C .74.6410⨯
D .7
46.410⨯
6. ()24-的算术平方根是: A. 4 B. 4± C. 2 D. 2±
7. 化简x 2+x x -1+x +11-x =
8. 若分式1
2-x 与1互为相反数,则x 的值是 . 9. 一元二次方程2260x -=的解为___________________.
10. 已知方程2520x x -+=的两个解分别为1x 、2x ,则1212x x x x +-⋅=
1. 实数2-,0.3,17π-中,无理数的个数是( ) A .2 B .3 C .4 D .5
2. 计算: 0
0145tan )21(4)31(--++--
3. 因式分解:y y x 92-=_____________.
4. 方程:0252=-x 的解是__________________.
5. 若12a =,则221(1)(1)a a a +++的值为 .
6. 分式1
12+-x x 的值为0,则 A..x=-1 B .x=1 C .x=±1 D .x=0 7. 计算x x ÷)2(3的结果正确的是( )A )28x B )26x C )38x D )36x 8. 已知关于x 的一元二次方程01)12=++-x x m (有实数根,则m 的取值范围是 .
9. 已知关于x 的一元二次方程的一个根是1,写出一个符合条件的方程
10. 将分式方程1
3)1(251+=++-x x x x 去分母整理后得: (A )018=+x (B )038=-x (C )0272=+-x x (D )0272=--x x
练习10
1. 计算:1021()2)(2)3
---2.2009年第一季度,眉山市完成全社会固定资产投资82.7亿元,用科学记数法表示这个数,结果为 元。
3. 分解因式:2
6_________.x x += 4.化简:(a -2)·a 2-4a 2-4a +4 =___________。
5. 下列命题是真命题的是( )
A .若2a =2
b ,则a =b B .若x =y ,则2-3x ﹥2-3y
C .若2x =2,则x
D .若3x =8,则x =±2 6. 要使1
213-+
-x x 有意义,则x 应满足( ). A .21≤x ≤3 B .x ≤3且x ≠21 C .21<x <3 D .21<x ≤3 7. 方程x (x -1)=2的解是
A .x =-1
B .x =-1
C .x 1=1,x 2=-2
D .x 1=-1,x 2=2
8. 一元二次方程220x x +-=的两根之积是( ) A .-1 B .-2 C .1
D .2 9. 分式方程131
x x x x +=--的解为 A .1x = B .1x =-
C .3x =
D .3x =- 10. 解方程:1211+=-x x。