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In 1831 ,Joseph Henry in the United States discovered the phenomenon of electromagnetic induction.
接收机是由几个单元组成的。
A receiver consists of several units.
若x>0，则该方程无解。
For x>0, there is no solution to the equation.
现在我们需要解这个方程，求出哪个未知数来。
Now it is necessary for us to solve this equation for that unkown.
在把这些值代入后，人们发现v就等于光速。
Accurate in operation and high in speed, computers have found wide applications.
现有的中型计算机的运算能力与不久前 的大型计算机一样。
Medium-size computers now perform as large computers not long ago.
练习2
Ⅱ
这本书对电子工程师来说是及有帮助的。
This book is of great help to electronic engineers.
在前四章中，第三章最重要。
Of the first four chapters, Chapter 3 is the most important.
在计算机中，趋势是以尽可能高的时钟速率工作。
In a computer, the tendency is to operate at as high a clock rate as possible.
在电容器上的电压为零点零几伏。
The voltage across this capacitor is a few hundredths of a volt.
练习1：
Ⅱ
输入信号太大会引起非线性失真。
Nonlinear distortion can be caused by too large an input signal.
利用斜率的定义，我们能导出表示直线的方程。
Using the definition of slope, we can derive the equation which presents a straight line.
Impedence in an a-c circuit plays the same role that resistance does in a d-c circuit.
相距一段距离的两根平行导线载有电流I。
Two parallel wires a distance apart carry the current I.
This computer is very small in size.
这些波只朝一个方向传播。
These waves travel only in one direction.
在研究电学时，物理学家们定义了电场强度。
In their study of electricity, physicists defined electric field intensity.
锡的熔点没有铝高。
Tin does not have as high a melting point as lead.
这个平均速度是末速度的一半。
This average velocity is half the final velocity.
必须弄清解这个方程需要多长的时间。
It is necessary to find how long a time it takes to solve this equation.
f(x+h)-f(x)这一表达式经常用在微积分方面。
The equation f(x+h)-f(x) is frequently used in the study of calculus.
能写成以下形式的方程被称为含有一个未知数的线性方程。
An equation which can be written in the following form is known as a linear equation in one unknown.
输入电压变为负值而能量则保持不变。
The input voltage goes negative and the energy stays constant.
这些射线似乎来自于成像。
These rays seem to come from the image.
交流电路中的阻抗起着与电阻在直流电路中相同的作用。
Upon substitution of these values, it is found that v is equal to the velocity of light.
电容是用法拉为单位来度量的。
Capacitance is measured in farads.
这台计算机的体积很小。
这里我们使用相距两米的两个金属球。
Here we use two metal balls two meters apart.
本书没有什么新内容。 This paper contains nothing new.
该力垂直于桌面作用。
The force acts perpendicular to the surface of the table.
这根导线比那根粗三倍。
This wire if four times thicker than that one.
电可以容易地被转变成其他形式的能量。
Electricity can be easily changed into other forms of energy.
1831年美国的约瑟夫?亨利发现了电磁感应现象。
黑洞是看不见的，但它的存在是可以推断出来的.
The black hole is invisible, but its presence can be deduced.
电磁波以光速传播，为其通行不需要任何物质。
Electromagnetic light, and require no material fo their passage.
电子是存在于普通物质中的最小微粒。
Electrons are the smallest particles present in ordinary matter.
现有的教科书均讨论了这一问题。
All the textbooks available discuss this problem.
计算机由于运算准确、速度快而得到了广泛的应用。
十年前该厂的产量仅为现在的五分之一。
The output of the factory ten years ago was only one fifth what it is now.
这两个数值之差为万分之十三。
The difference between these two values is 13 parts in 10 4.
To repair the machine, the cover has to be removed.
The preface of this book is well written.
练习3
Ⅱ
由于反馈在电子线路中起着重要的作用，所以对它的研究极为重要。
Since feedback plays an important role in electronic circuits, its study is of great importance.
这一规则可用于一切整数，包括正的和负的。
This rule can be used for all intergers, both positive and negative.
中子具有稍大于质子的质量。
A neutron has a slightly larger mass than proton.
Xx，男，教授，博士生导师，中科院院士。1953年毕业于解放军通信工程学院雷达系，毕业后留校任教，历任教研室主任，系主任、副院长。
Xx: male , professor , advisor for doctoral stuents, and academician of the Chinese Academy of Sciences.He graduated from the Department of Radar at the Institute of the Communications Engineering of the People’s Liberation Army of China in 1953.
解这道题很容易。
This problem can be solved with great ease.
在这种情况下，电流导前电压90.
In this case , current leads voltage by 90.
通过分析这台设备的参数，我们可以了解它的性能。
Through the analysis of the parameters of this device, we can understand its performance.
these multimeters are very alike in size and weight.
This voltage almost can not be measured.
In this laboratory, this instrument is better than any one .
这里的这些式子很重要。
The equation here are of great importance.
我们将使用一根10 米长的电缆。
We shall use a cable 10 meters long.
Ⅲ
that professor is very interesting in this topic.
Another comsat has been launched in the morning of the 8th of October.
Ⅳ
物体经受简谐运动的周期是为使它作一完整震荡所需的时间，对弹簧而言，周期就是弹簧在从其最大的伸长，通过其最大的压缩并又一次回到其最大伸长过程中所用的时间。对各类简谐运动来说，周期T表示为。式中加速度a是物体处于特定位置时所经历的加速度。
这个答案看起来是正确的。
This answer appears correct.
这个系数有待确定。
This coefficient remain to be determined.
下面两个式子在后面章节将被经常用到。
The two equations below will be used ofen in later chapters.
Ⅲ
The new designed inshtrument is in good quality.
This engine needs (requires,wants) being cleaned.
This running machine will stop of itself in one minute or two.
In this case, the input does not fall; the output does not fall,too.
The resistance of a conductor not only depends on the material with which the conductor is made,but also on the size and temperature of the conductor.
接收机是由几个单元组成的。
A receiver consists of several units.
若x>0，则该方程无解。
For x>0, there is no solution to the equation.
现在我们需要解这个方程，求出哪个未知数来。
Now it is necessary for us to solve this equation for that unkown.
在把这些值代入后，人们发现v就等于光速。
Accurate in operation and high in speed, computers have found wide applications.
现有的中型计算机的运算能力与不久前 的大型计算机一样。
Medium-size computers now perform as large computers not long ago.
练习2
Ⅱ
这本书对电子工程师来说是及有帮助的。
This book is of great help to electronic engineers.
在前四章中，第三章最重要。
Of the first four chapters, Chapter 3 is the most important.
在计算机中，趋势是以尽可能高的时钟速率工作。
In a computer, the tendency is to operate at as high a clock rate as possible.
在电容器上的电压为零点零几伏。
The voltage across this capacitor is a few hundredths of a volt.
练习1：
Ⅱ
输入信号太大会引起非线性失真。
Nonlinear distortion can be caused by too large an input signal.
利用斜率的定义，我们能导出表示直线的方程。
Using the definition of slope, we can derive the equation which presents a straight line.
Impedence in an a-c circuit plays the same role that resistance does in a d-c circuit.
相距一段距离的两根平行导线载有电流I。
Two parallel wires a distance apart carry the current I.
This computer is very small in size.
这些波只朝一个方向传播。
These waves travel only in one direction.
在研究电学时，物理学家们定义了电场强度。
In their study of electricity, physicists defined electric field intensity.
锡的熔点没有铝高。
Tin does not have as high a melting point as lead.
这个平均速度是末速度的一半。
This average velocity is half the final velocity.
必须弄清解这个方程需要多长的时间。
It is necessary to find how long a time it takes to solve this equation.
f(x+h)-f(x)这一表达式经常用在微积分方面。
The equation f(x+h)-f(x) is frequently used in the study of calculus.
能写成以下形式的方程被称为含有一个未知数的线性方程。
An equation which can be written in the following form is known as a linear equation in one unknown.
输入电压变为负值而能量则保持不变。
The input voltage goes negative and the energy stays constant.
这些射线似乎来自于成像。
These rays seem to come from the image.
交流电路中的阻抗起着与电阻在直流电路中相同的作用。
Upon substitution of these values, it is found that v is equal to the velocity of light.
电容是用法拉为单位来度量的。
Capacitance is measured in farads.
这台计算机的体积很小。
这里我们使用相距两米的两个金属球。
Here we use two metal balls two meters apart.
本书没有什么新内容。 This paper contains nothing new.
该力垂直于桌面作用。
The force acts perpendicular to the surface of the table.
这根导线比那根粗三倍。
This wire if four times thicker than that one.
电可以容易地被转变成其他形式的能量。
Electricity can be easily changed into other forms of energy.
1831年美国的约瑟夫?亨利发现了电磁感应现象。
黑洞是看不见的，但它的存在是可以推断出来的.
The black hole is invisible, but its presence can be deduced.
电磁波以光速传播，为其通行不需要任何物质。
Electromagnetic light, and require no material fo their passage.
电子是存在于普通物质中的最小微粒。
Electrons are the smallest particles present in ordinary matter.
现有的教科书均讨论了这一问题。
All the textbooks available discuss this problem.
计算机由于运算准确、速度快而得到了广泛的应用。
十年前该厂的产量仅为现在的五分之一。
The output of the factory ten years ago was only one fifth what it is now.
这两个数值之差为万分之十三。
The difference between these two values is 13 parts in 10 4.
To repair the machine, the cover has to be removed.
The preface of this book is well written.
练习3
Ⅱ
由于反馈在电子线路中起着重要的作用，所以对它的研究极为重要。
Since feedback plays an important role in electronic circuits, its study is of great importance.
这一规则可用于一切整数，包括正的和负的。
This rule can be used for all intergers, both positive and negative.
中子具有稍大于质子的质量。
A neutron has a slightly larger mass than proton.
Xx，男，教授，博士生导师，中科院院士。1953年毕业于解放军通信工程学院雷达系，毕业后留校任教，历任教研室主任，系主任、副院长。
Xx: male , professor , advisor for doctoral stuents, and academician of the Chinese Academy of Sciences.He graduated from the Department of Radar at the Institute of the Communications Engineering of the People’s Liberation Army of China in 1953.
解这道题很容易。
This problem can be solved with great ease.
在这种情况下，电流导前电压90.
In this case , current leads voltage by 90.
通过分析这台设备的参数，我们可以了解它的性能。
Through the analysis of the parameters of this device, we can understand its performance.
these multimeters are very alike in size and weight.
This voltage almost can not be measured.
In this laboratory, this instrument is better than any one .
这里的这些式子很重要。
The equation here are of great importance.
我们将使用一根10 米长的电缆。
We shall use a cable 10 meters long.
Ⅲ
that professor is very interesting in this topic.
Another comsat has been launched in the morning of the 8th of October.
Ⅳ
物体经受简谐运动的周期是为使它作一完整震荡所需的时间，对弹簧而言，周期就是弹簧在从其最大的伸长，通过其最大的压缩并又一次回到其最大伸长过程中所用的时间。对各类简谐运动来说，周期T表示为。式中加速度a是物体处于特定位置时所经历的加速度。
这个答案看起来是正确的。
This answer appears correct.
这个系数有待确定。
This coefficient remain to be determined.
下面两个式子在后面章节将被经常用到。
The two equations below will be used ofen in later chapters.
Ⅲ
The new designed inshtrument is in good quality.
This engine needs (requires,wants) being cleaned.
This running machine will stop of itself in one minute or two.
In this case, the input does not fall; the output does not fall,too.
The resistance of a conductor not only depends on the material with which the conductor is made,but also on the size and temperature of the conductor.