练习一1 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.2 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 represents a straight line.3 f (x+h)-f(x)这一表达式经常用在微积分方面。

The expression f (x+h)-f(x) is frequently used in the study of calculus.4 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.5 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.6 该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.7 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 now8 这两数值之差为万分之十三。

The difference between these two values is 13 parts in 104.9 锡的熔点没有铅高。

Tin does not have as high a melting point as lead (does).10. 这个平均速度是末速度的一半This average velocity is half the final velocity.11 必须弄清解这个方程需要多久的时间Itis necessary to find how long a time it takes to solve this equation.12 这根导线比那根粗三倍This wire is four times thicker than that one.13. 电可以容易的被转变成其他形式的能量Electricity can be easily changed into other forms of energy.14 1831年美国的约瑟夫亨利发现了电磁感应现象.In1831, Joseph Henry in the United States discovered the phenomenon of electromagnetic induction15 收音机是由几个单元组成的A receiver consists of several units练习二1 这本书对电子工程师来说是极有帮助的。

This book is of great help to electronic engineers.2 在前四章中，第三章最重要。

Of the first four chapters, Chapter3 is the most important.3 解这道题很容易。

This problem can be solved with great ease.4 在这种情况下，电流导前电压90º。

n this case, current leads voltage by 90º.5 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 [或：By analyzing the parameters of this device], we can understand its performance.6 若x>0，则该方程无解。

For x > 0, there is no solution to the equation.7 现在我们需要解这个方程，求出那个未知数来。

Now it is necessary for us to solve this equation for that unknown.8 在把这些值代入后，人们发现v就等于光速。

Upon substitution of these values, it is found that v is equal to the velocity of light.9 电容是用法拉为单位来度量的。

Capacitance is measured in farads.10.这台计算机的体积太小This computer is very small in size .11. 这个些波朝一个方向传播These waves travel only in one direction .12. 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.13 这个答案看起来是正确的。

This answer appears correct.14 这个系数有待确定。

This coefficient remains to be determined.15 下面两个式子在后面章节将被经常提到。

The two equations below will be used often in later chapters.16 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.17本文没有什么新内容。

This paper contains nothing new. [或：There is nothing new in this paper.].18 该力垂直于桌面作用。

The force acts perpendicularly to the surface of the table.19 这一规则可用于一切整数。

This rule can be used for [或：…can apply to] all integers, both positive and negative.20 中子具有稍大于质子的质量。

A neutron has a slightly larger mass than a proton. [或：…has a mass slightly larger than that of a proton.]21 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. [或：…particles that exist in ordinary matter].22.现有的可教书均讨论了这一问题All the textbooks available iscuss this problem.23. 计算机由于运算准确，速度快被广泛的应用Accurate in operation and high in speed .24. 现在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.25. 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.26.这些射线似乎来自于成像These rays seem to come from the image.27 交流电路中的阻抗起着与电阻在直流电路中相同的作用。

Impedance in an a-c circuit plays the same role that resistance does in a d-ccircuit.28 相距一段距离的两根平行导线载有电流Two parallel wires a distance of apart carry the current29 这里的这些式子很重要The equations here are of greate importance30 我们将使用一根10米长的电缆We shall use a cable 10 meters long.练习三1 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.2 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.3 电磁波以光速传播，因为其通行不需要任何物质。

Electromagnetic waves travel at the speed of light, and require no material for their passage.4 从把它定义为距离与时间之比，速度是以米每秒来表示的From its definition as the ratio of distance to time, speed is expressed in meters per second.5 它们在这种情况下的差别为百万分之十三。

Their difference in this case is 13 parts in a million.6 我们对二极管的分析将是很有意义的Our analysis of the diode will be of great significance.7.这有助于我们把它用在电炉分析中This facilitates their use in circuit analysis.8. 设计的成功与否取决于我们对电路的选择The success in design depends on our correct choice of the circuit.9.必须把他们相互之间的碰撞考虑进去。