信息科学与电子工程专业英语课后答案--王朔中

信息科学与电子工程专业英语课后答案--王朔中

信息科学与电子工程专业英语课后答案--王朔中科技英语课件

Exercises

Unit 1 Exercises Unit 1 Exercises

(1) Translate the following sentences into Chinese. (1)

Translate the following sentences into Chinese.

1. As with series resonance, the greater the resistance in the

circuit the lower the Q and, accordingly, the flatter and

broader the resonance curve of either line current or circuit

impedance.

对于串联谐振，电路中的电阻愈大Q值就愈低，相应

地线路电流或电路阻抗的谐振曲线也就愈平、愈宽。

2. A wire carrying a current looks exactly the same and

weighs exactly the same as it does when it is not carrying a

current.

一根带电的导线其外表与重量都与不带电导线完全一

样。

3. Click mouse on the waveform and drag it to change the

pulse repetition rate, or directly enter a new value of the

period in the provided dialogue box, while keeping the

pulse width unchanged.

在波形上点击鼠标并拖动来改变脉冲重复频率，或者在

提供的对话框中直接输入新的周期值，而保持脉冲宽度

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不变。

4. Electronics is the science and the technology of the

passage of charged particles in a gas, in a vacuum, or in a

semiconductor. Please note that particle motion confined within a metal only is not considered electronics. 电子学是一门有关带电粒子在气体、真空或半导体中运动的科学技术。注意，在本书中粒子运动仅限于金属的

情况不属于电子学。

5. Hardware technologies have played vital roles in our ability

to use electronic properties to process information, but software

and data processing aspects have not developed at the same

speed.

硬件技术在我们使用电子特性来处理信息的能力中一

直起着重要作用，而软件及数字处理方面却没能与硬件

同步发展。

6. However, in a properly designed DC amplifier the effect of

transistor parameter variation, other than Ico, may be practically

eliminated if the operation point of each stage is adjusted so that

it remains in the linear operation range

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of the transistor as temperature varies.

然而在设计得当的直流放大器中，若调节每一级的工作

点使之在温度变化时保持在晶体管线性区，就能在实际

上消除Ico以外的晶体管参数变化所造成的影响。

(2) Fill in the blanks with the most appropriate choice. (2) Fill

in the blanks with the most appropriate choice.

1. A message signal can any amplitude value

between 0 and A volts.

A. assume

B. use

C. receive

D. accept

2. Each time a positive clock edge occurs, the flip-flop changes state, leading to half as many pulses at the output

to the clock input.

A. as

B. compared

C. due

D. so as

3. In the previous section we discussed sine-wave or CW

modulation systems in which the modulating signal

_______ of a digital pulse train.

A. made

B. consisted

C. contained

D.

got

4. In this book we shall emphasize the limitations imposed

on the information transmitted by the system through

which it was _______ and shall attempt some comparison

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of different systems.

A. put

B. traveled

C. passed

D. viewed

5. This signal either does not change, or it changes ______

by an amount equivalent to one or more quantum steps.

A. interruptedly

B. rudely

C. abruptly

D. absolutely

6. We shall only be _______ with logical representations, not

absolute values

A. interested

B. caring

C. referred

D. concerned

(3) Choose the phrase that is closest in meaning to the (3)

Choose the phrase that is closest in meaning to the

underlined part. underlined part.

1. It is all too easy with linear circuits, which appear

relatively simple when compared with today’s complex

logic arrangements, to ignore detailed performance

parameters which can drastically reduce the expected

performance.

A. which has bad influence upon the system performance

B. which is important to ensure circuit linearity

C. which is possible to enhance the system performance

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D. which is crucial for maintaining the desired

performance

2. Therefore there will be a slight time delay, due to the

propagation delay of the flip-flops between the time one flip-flop changes state and the time the next one changes state, i.e.,

the change of state ripples through the counter,

and these counters are therefore called ripple counters. A.

the

state change is propagated through the counter like

ripples B. the state changes cause ripples in the counter

C. passing through the counter, the state ripple changes

D. the state of the counter changes due to ripples

3. Instead of triggering on each pulse, a phase lock technique

examines the relative phase between each oscillator and many of

its sync pulses and adjusts oscillator frequency so that the

average phase discrepancy is small.

A. checks each oscillator for many sync pulses

B. checks the phase relationship between individual

oscillators and a collection of sync pulses C. looks at the

relations between the phase and the sync

pulses

D. examines whether the phase is relative to the oscillator

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and the sync pulses

4. By keeping the off state slightly below threshold, the delay