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1、V、练习参考答案 练习1I、1、the（各项均为负。) 2、the; a （功率额定值是电阻器不会引起温度太大的上升而能安全地耗散的最大功率。） 3、an（这是均方根值伏特计。） 4、The; a（该设备的成功设计需要详细地了解性能指标。） 5、the; a; a（在氢原子的布尔模型中，一个电子绕一个质子以半径为R的圆周运转。） 6、the（电阻的单位是欧姆。） 7、an （这是一个h参数。） 8、/; /（图51画出了Oersted的实验。） 9、A; a; a（机器是能够传递力来完成某一确定目的的一种设备。） 10、/（水压机将在第14章加以考虑。） 11、the; the /（我们容易确
2、定参数的值。） 12、/; the（根据式（21），我们得到以下的关系式。） 13、the; /（作者工作在位于阿林顿的得克萨斯大学。） 14、an（甚至当积分区间并不是无穷时，能够恰当地显示一个时函数的傅氏变换的仪器是多么重要啊！）II、1. Dr. Emmet graduated from Harvard University in 2001.2. Professor Li earned his Ph.D. degree in mechanical engineering from the Xian University of Technology in 1988.3. Now we sh
3、all turn to the discussion of local area networks.4. The Bainbridge mass spectrometer is as important an instrument as the optical spectrometer.5. How long a time 或How much time is required to this experiment? The density of a substance is its mass per unit volume.6. An increase in pressure always c
4、auses a decrease in volume.7. Fig. (2-5) shows what is expressed by Eq. (2-2).8. The unit of inductance is the henry.III、1. The UASMA protocol employs a unique frame structure.2. Finally, a broad stepped impedance transformer is designed by this method.3. Dynamic analysis and evaluation of the secur
5、ity of a proactive secret sharing system4. The approach can be applied to the one-dimensional potential barrier with an arbitrary profile.5. We propose a numerical method based on Newtons iterative method. 练习2I、1. This circuit consists of a battery, an inductor and a capacitor.2. Compute the electri
6、c fields at points a, b, and c.3. This satellite is used for communications between the United States and Great Britain, France and Italy.4. We assume that the antenna is vertical and that its loss is zero.5. Chapters 6, 7, and 8 deal with transmission lines.II、1. Its error is six parts in 1012.2. T
7、his computer stores four times more information than that one (does).3. The demand for this kind of equipment in the near future will be 20 times what it is.4. The voltage across this component is a few tenths of a volt.5. Now its internal pressure is one third what it was.III、1. This object is over
8、 five times heavier than that one is.2. Unless otherwise stated, it is assumed that silicon transistors are used and that ICBO can be neglected.3. This circuit has the advantages of simple structure and easy adjustment.4. Figs. 1, 2, and 3 show this process in detail.5. For further information, cons
9、ult references 3, 5, 9. 练习3I、 1. This new type of computer has many advantages over the general type.2. It is not difficult to solve this differential equation for the unknown quantity. 3. Of these five new chapters, the first one deals with the basic principles of negative feedback.4. At this point
10、/time, current differs in phase from voltage by 90o.5. By analyzing By the analysis of the parameters of the instrument, we can understand its performance.6. We will find out its average velocity over this distance.7. The science of electronics is too important in the world today. 8. They solved thi
11、s problem with great difficulty.II、 1. For x1, there is no solution to this equation this equation has no solution.2. Upon On substituting substitution of these values into in theequation, we obtained the following expression.3. This circuit is similar in operation to that of Fig. 1-10.4. This compu
12、ter is very good in performance. 5. These waves travel only in one direction.III、 1. This paper presents a new method for the recognition of radar targets.2. The influence of the moving state of the target on the tracking accuracy of the EKF is great.3. Another comsat was launched on the morning of
13、the 8th of October.4. Voltage is measured in volts.5. They will leave for Beijing to attend an international conference on mobile communication.6. Unless otherwise stated, it is assumed that silicon transistors are used and that ICBO can be neglected.7. 练习4I、 1. The force acts perpendicular to the s
14、urface of the table.2. The three coefficients here remains to be determined.3. The two equations below will be often (frequently) used in later chapters/in the chapters which follow.4. Here we use two metal balls 10 cm apart.5. The output remains/stays constant/unchanged/fixed/unaltered/the same. 6.
15、 All the textbooks available discuss this problem.7. Accurate in operation and high in speed, computers have found wide applications.8. The answer to this problem looks correct. 9. Two parallel wires a distance (of)apart carry the current i. 10. The problem now is how to measure the voltage across t
16、his component. 11. These data will be sent to the computing center 2 kilometers away. 12. Upon rearranging the equation above, we have get, obtain the following expression. 13. These charges can interact with other charges present. 14. Forces can be transmitted without contact, contrary to the commo
17、n belief. 15. This coefficient is typically 0.35.II、1. In this case, the input does not fall; nor neither does the output. ; the output does not fall, either.2. The resistance of a conductor depends not only on the material of which the conductor is made, but also on the size and temperature of the
18、conductor.3. These scientists are very interested in this topic.4. This parameter can hardly be measured.5. In this laboratory, this instrument is more expensive than any other one/ any one else.6. The features of this device are small size and light weight. 练习5I、 1. This equation can be solved in e
19、ither of the following two ways/the two ways which follow.2. This baseball will soon come to rest because of its interaction with the ground.3. Our choice of this coefficient as 1 is correct.4. From its definition as the ratio of a force to a length, we can see that k has the same unit as work (does
20、). 5. Our analysis of the machine is of great significance. 6. This facilitates their use in circuit analysis.II、1. This police car is equipped with a receiver the size of a matchbox. 2. Wires one hundredth the diameter of a silk thread are used to connect these components.3. We must water cool thes
21、e equipments/devices. 4. In the past, telephone calls were operator connected.5. AC can be changed/turned/converted/transformed/translated into/to DC, a process called/known as/referred to as rectification.6. A magnet attracts iron materials, a familiar phenomenon. 7. Computers are capable of proces
22、sing information, a process that previously could be accomplished only inside our heads. 8. An instrument for measuring current, voltage, and resistance, the multimeter is widely used in electrical engineering.III、1. Secs. 1.1 and 1.2 will discuss several other problems.2. Problems are listed/given
23、on pp. 1-5.3. In the equations above, all hs are the hybrid parameters.4. The mass of the standard pound is equal to 0.4535924277 kilograms.5. All as and bs in Eq. (5-1) are related to the impedance Ro.6. We must take the effect of temperature on upon semiconductors intoaccount.7. In this case, the
24、variation of output with input is very small.8. This curve shows the dependence of distance on/upon speed. IV、1. None of them can solve this special type of differential equation.2. They do not know whether this material can stand so large a force or not.3. There are M polygons altogether, each of w
25、hich has N vertexes.4. These two engineers are busy (in) designing a new kind of software.5. Iron is almost as good a conductor as aluminum. 练习6I、1. This image, it will be noticed, is a real image.2. This technical problem, we hope, will be solved soon.3. 210 is approximately 1000, a fact that we th
26、ink is very useful in the study of digital electronics.4. A resistor of say 100 ohms should be used here.II、 1. None of those textbooks have/has mentioned this point.2. All of these x values cannot satisfy the equation.3. Neither of the two conditions is satisfied here.4. In the preceding/previous c
27、hapter, we discussed all kinds of force.5. This paper describes a new method for designing aircraft.6. By the end of the last century, the company had manufactured 5 000radars. 7. Since 2008, this research institute has been developing a special kind of robot.III、 1. In Section 1-2, the concept of f
28、orce was introduced.2. As early as the 1940s, it was found that semiconductors are very useful. 3. This result can also be arrived at in another way.4. At that time no use was made of this phenomenon/, thisphenomenon was made no use of.5. This point will be dealt with in the next section.IV、 1. This
29、 computer works much better than that one (does)/This computer is much better in performance than that one (is).2. This computer requires many more components that that one (does).3. The distance of the moon from the earth is as great as 240 000 miles.4. The greater the resistance, the longer time i
30、t takes for the capacitor to reach its maximum voltage/, the longer time is required for the capacitor to reach its maximum voltage.) 5. The current as small as 0.1 A cannot produce enough heat.V、 1. It is easy for us to determine the weight of the body. 或：We can determine the weight of the body eas
31、ily.2. The two engineers are busy (in) designing a new type of computer.3. We find this concept very difficult to explain.4. None of these windows can withstand so large a force.5. Work equals is equal to force multiplied by/times distance. 6. The results obtained agree with the experimental values.
32、 are in agreement with the experimental values. 练习7I、 1. It will take a few months to design this kind of aircraft with the help of a computer. 2. It is left as a problem to for the reader to show that this expression holds. 3. The program to be executed is stored in this unit. 4. This valley acts a
33、s the foundation on which to build the dam. 5. In this laboratory there are many kinds of instrument for students to choose from. 6. Let t0 equal/be equal to zero. 7. The farther away the target (is), the longer time it takes for the echo to return. 8. For the series to converge, x must be less than
34、 1. 9. We find this concept very difficult to understand. 10. This method makes it much easier to detect targets. 11. This factor will affect the ability of a computer to store information. 12. We have to find out how large to make r so as for the series to converge. 13. This is a pen to draw pictur
35、es with. 14. Elasticity is the tendency of a body to return to its original condition after being deformed. 15. Ordinary matter is said to be electrically neutral. 16.This property makes it possible for metals to be made into any shape. 17. This table is unfit for a student to do experiments on. 18.
36、 Now we consider what path of integration to take.II、 1. The sine law of the variation of the cylinder diameter with light intensity has been emphasized. 2. Not only do temperature and light affect the conductivity, but the addition of impurities to semiconductors also makes it change greatly. 3. Va
37、rious satellites are frequently launched to obtain information about/on space. 4. Our semiconductor industry came into being at the end of the 1950s. 5. My colleagues and I would like to express our thanks to Professor W. Smith for his great help. 练习8I、 1. The amplifier amplifies the received signal
38、s. 2. Moving molecules have kinetic energy. 5. Fig. 1 3 shows the photo of a freely falling body. 3. Speed equals distance divided by time. 4. Voltage equals/is equal to current multiplied by resistance. 5. The resistance of air increases with the increased/increasing/an increase in speed. 6. A tran
39、sformer is a device consisting of two or more coils wound on/round an iron core. 7. It is necessary to find out the current flowing through this component. 8. This book, properly used, will be of great help to the reader. 9. Flowing through a circuit, the current will lose part of its energy. 10. Gi
40、ven/Knowing time and speed, we/one can find out distance. 11. Having studied this chapter, the student will understand/will have understood the principle of a computer. 12. The speed of light being extremely great, we cannot measure it by ordinary methods. 13. Several comsats were launched, all of t
41、hem (being) high-altitude satellites. 14. Called “the mother of all networks,” the Internet is a widely used international network. 15. This force can be resolved into two components, one (being) horizontal and the other vertical.II、1. Let us construct/draw a circle with the origin as the center and
42、 ofradius R.2. This parameter should be measured with E grounded. 3. With no resistance in the circuit, the current will increase indefinitely. 4. With this in view, we have written this book. 5. This paper introduces a new design method/technique, with emphasis on its principle.III、1. Let us consid
43、er designing a computer.2. We refer to these components as being passive.3. This involves taking the Fourier transform.4. On/Upon rearranging the above equations, we obtain the following setof equations. 5. In using this equation, it does not matter which plane is considered asIV、 1. Given/Knowing r
44、esistance and current, one/we can determine/calculate voltage. 2. The price of this instrument is high. 3. A robot is a special kind of electronic device. 4. The current starts flowing at the very moment we close the circuit. 5. They have been designing a new type of computer these six months. 练习9I、
45、 1. The problem was not solved until a completely different method was introduced. 2. Nearly 100 years passed before the existence/presence of subatomic particles was confirmed by experiment/experimentally. 3. The year this device was invented, World War II broke out. 4. Small as they are, atoms are
46、 made up of still smaller particles. 5. These two resistors should be selected/chosen so that the transistor can operate normally. 6. The body is in such a state that it can do work. II、 1. The relation that voltage is the product of current and resistance applies to all the dc circuits. 2. The discovery that magnetism can produce current is extremely important in the field of electricity. 3. An equation is an algebraic statement that two algebraic expressions are equal. 4. There is evidence that no life exists on the moon. 5. The question