Key to the Exs1112文档格式.docx

1、8. There is another kind of force （that） we need to consider.9. Now this disease is no longer the serious problem （that） it once was.10. The places where small computers can be used seem （to be） endless.11. Radar can measure the time （that） it takes for the radio echo to return.12. We must calculate

2、 the distance （that/through which） the body is lifted.13. The direction （that /in which） a body moves is also very important.14. It is necessary to determine the number of times （that /by which） this amplifier amplifies signals.15. All we need （to） do is （to） press this button.16. All one can say is

3、 that an atom consists of still smaller particles.17. I1 is much larger than I2, in which case I2 can be neglected.18. We equate these two ratios, from which the simplest formula follows/ results.19. The reason （why/ for which/ that） this component is used here is quite clear.20. It is necessary to

4、determine the time （when/ at which /that） the y-component has decreased to zero.21. We first discuss the waves whose frequencies/ the frequencies of which are constant.22. Any radio-frequency component （that） there may be /that （there） may exist in this circuit is filtered out by capacitor C.23. We

5、can find a few conditions, of which only two /only two of which are necessary.24. The curve the y-coordinate of each point on which is zero is just the x-axis.II.1. The point at which the circle cuts the axis of reals is where = .2. We can find the single force to which these two factors are equival

6、ent.3. The particular frequency at which XL = XC is called the resonant frequency.4. These vectors are not added the way （in which/that） numbers are added.5. The force of gravity means the force with which the earth attracts a body.6. The surface of a picture tube upon which the electrons produce th

7、e picture is called the screen. 7. In all resistances through which a current flows, electrical energy is converted into heat energy.8. The product of a force and the time during which it acts is called impulse.9. This resistor is the one across which the negative bias is developed.10. A magnet can

8、cause an electric current in a wire near which it is moved.11. Any mechanical device by which heat is converted into work is called a heat engine.12. The author would like to express thanks to the editors of the series of which this book is a part/ to which this book belongs.13. This is a parallelog

9、ram of which the two given vectors are sides.14. The pressure is equal to the total force divided by the area over which it is exerted.15. The two elements of which water consists are hydrogen and oxygen.16. This depends on the efficiency with which electrons are produced.17. These two laws are the

10、foundation on which all other laws are built.18. The substances in which there are many free electrons are conductors.19. It is necessary to explain the reason for which this device is used here.20. The temperature at which water freezes is generally 0oC.III.1. As we shall see, acids and bases play

11、an important role in the functioning of life.2. As the title indicates, this chapter will discuss nonlinear equations.3. As the names shows, a fluid is a substance which flows readily.4. As was discussed in the previous chapter, a transistor is a current-control device. 5. This waveform has a dc com

12、ponent, as will be explained later.6. This single force produces the same effect as is produced by those forces together. 7. The sign of the charge does not affect the conclusion, as can be seen readily.8. Now we are able to solve such differential equations as occur in physics.9. This function can

13、be accomplished by using the full adder as was described in the previous section.10. Radio waves travel at the same speed as light.11. Torricellis emptiness will appear on the upper part of the tube, or vacuum as we now call it （= what we call vacuum）.12. These concepts enables us to understand a wi

14、de range of phenomena in electrostatics, or “static electricity,” as it is called. OR: , or what is called “static electricity”13. This revision resulted in the creation of high-speed mechanics, or as it is referred to, “relativistic mechanics.”OR: , or what is referred to as “relativistic mechanics

15、”.14. This current is, as predicted, very small.15. First let us consider the simplest circuit as shown on page 2.IV. 1. This is a slightly higher value than we predicted.2. Many more problems are presented than need be given as homework assignments.3. Nearly all amplifiers require more amplificatio

16、n than only one transistor can achieve.4. This reactor can produce more fuel than it consumes.5. Let us consider the case when the torque is zero.6. We must determine the values of currents and voltages after the switch closes. 7. It is necessary to first find the limit as c approaches infinity. 8.

17、During the 10 years since this book was first published, significant changes have taken place （= have been seen） in plastics industry.V. In the spring of 2003, as a new type of infectious disease, the SARS attacked the globe （=The spring of 2003 saw the sudden attack of the globe by the SARS, a new

18、type of infectious disease）. Its origin, developing trend and therapeutic schedule are the topics which are to be urgently tackled, but they are difficult problems full of numerous unknowns. It is from the viewpoint of statistics that this paper presents a mathematical model for/ of the developing t

19、rend of SARS cases. The function p （t） for/ of the variation of the number of cases with time consists of two parts. For the reader to understand the guideline of thought for the derivation of the model, let us consider the factors which follow （=the following factors）. It is worth pointing out that

20、 the parameters of the model are not invariable. At the same time/ Also it is necessary to pay much attention to the degree to which various measures have been put in place.VI.1. Even in this case these protocols can provide a limited number of users with the acceptable quality of voice service. 2.

21、A comparison of this method with the MEI method shows that the third postulate in the MEI method is questionable.3. This paper presents a method for an 8089 microcontroller to series-communicate with a 386 personal computer. 4. This paper deals mainly with the Wiener filtering of and the LMS algorit

22、hm for such signals.5. The effect of equalizer parameters on equalization performance is analyzed in detail. A detailed analysis is made of the effect of equalizer parameters on equalization performance.6. Each receiver channel in Fig.1 contains an RF amplifier, a mixer, an IF amplifier, an A/ D con

23、verter, etc. 7. The larger the abnormal extent （is）, the larger the residual mismatch is, with the curve going up. 8. A highland wild plant, JUEMA belongs to the rose family. （=JUEMA is a highland wild plant belonging to the rose family.） It contains vitamins and elements such as iron, magnesium, ca

24、lcium, （and） zinc. Pharmacological study shows that taking it for a long time （= a long-term intake） will prolong life, resist cancer and reduce weight. It is also a good gift for your relatives and friends.Ex. 121. Should anything abnormal happen, switch/ turn off the power supply at once /immediat

25、ely.2. If there were no （= Without） gravitation, everything would fly off the earth into space.3. If man made use of all the sunlight, he would have no need for coal or other fuels.4. If this change were to be included （=should be included） in the analysis, it would become extremely complex.5. Disco

26、ntinue should a skin reaction occur.6. Had electronic computers not been used, it would have taken them a long time to solve this problem.7. To pursue this development of molecular theory further would take us into the area of atomic and nuclear structure.8. It is very important that all solutions （

27、should） be checked in the original equation.9. It is suggested that this design （should） be modified at once.10. This requires that the transistor （should） be probably biased.11. Without semiconductors, satellite communications would be impossible.12. We could also have used Theorem 6 to derive the

28、result.13. It is quite essential that designers （should） have a practical knowledge of computers.14. This comes from the necessity that the output （should） be stable.15. The requirement that energy （should） be conserved must be satisfied.16. A necessary condition is that the integration （should） be

29、a solution of/ to Eulers equation.17. Their suggestion is that this point （should） be grounded.18. This transmission line acts as if it were open-circuited.19. It looked as if the answer to this problem had been wrong.20. Everything here, be it a component or a device, is homemade.21. Could a pin be

30、 drawn into a wire of the thickness of one atom, it would encircle the earth thousands of times.22. The condition that x - a （should） divide the numerator is that x=a （should） be a root.1. It was this scientist who/that discovered this phenomenon a century ago. 2. It is this conclusion with which we are concerned. It is this conclusion which /that we are concerned with.3. This method does work.