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第一周 词类（I）冠词、并列连接词、数词 单元测验一
1、 这台电压表/伏特计如此灵敏，可以测量出电压的微小变化。This is such ____ sensitive voltmeter that it can measure the slightest changes in voltage.
答案: a
2、 平均速度等于末速度的一半。The average velocity is about half ____ final velocity.
答案: the
3、 这个电路由电池、电阻器和电容器组成。This circuit consists of a battery, a resistor ____ a capacitor.
答案: and
4、 原子的中心，即原子核，包含了带正电荷的微粒，称为“质子”。The center, ____ nucleus, of an atom contains positively charged particles called protons.
答案: or
5、 读者学会这些基本概念很重要，否则后面内容的讨论理解起来会有困难。It is important for the reader to learn the basic concepts well, ____ the discussion of later topics will be difficult to understand.
答案: or
6、 这个电热器消耗的电能比那个电热器多三倍。This electric heater dissipates ____that one.
答案: four times as great energy as
7、 月球的质量为地球的八十分之一。The mass of the moon is ____.
答案: 1/80 that of the earth
8、 温度每上升一度，电容降低百万分之七百五。 The capacitance will decrease by _____ per each degree rise in temperature.
答案: 750 parts per million
9、 从1970年至1974年间，晶体管收音机的产量增长了五倍。From 1970 to 1974, the production of transistor radios was increased ___.
答案: by a factor of 6
10、 这个电源上的电流为零点零零几安。The current through the power supply is _.
答案: a few thousandths of an ampere
11、 这两极之间的电压很小。____ voltage between the terminals is very small.
答案: The
分析：本题考查定冠词the的特指用法，必须使用定冠词the。
12、 关闭开关，电路中的电流就会消失。Turn the switch off ____ the current in the circuit will disappear.
答案: and
分析：本题考查祈使句 + and + 句子这一结构，表达条件与结果的逻辑关系。句子译为：关闭电源，该电路中的电流就会消失。
13、 月球的体积约为地球的四分之一。（请用“倍数/分数+the +名词”的结构将句子补充完整）The moon is about one-quarter _____ the earth.
答案: the size of
分析：本句采用的是“倍数/分数+the +n”的句型结构。
14、 通过改变VBE零点零几伏特，就能极大的改变基极电流。By varying VBE only _____, the base current（基极电流）can be changed significantly.
答案: (以下答案任选其一都对)a few hundredths of a volt;
several hundredths of a volt
分析：零点零几表达的是百分之几，是a few hundredths， 因为分子不是1，所以序数词的分母要加s的复数形式，其后加介词of 加带有不定冠词的单位名词。
15、 在这样的角速度的时候，物体的重量将会是在一个重力加速度环境下的四倍。At this angular speed, the weight of a body will be four times __ in 1g environment.
答案: what it is
分析：本句采用的是“倍数/分数+what从句”的句型结构。
第二周 词类（II）介词 单元测验二
1、 These transistor（晶体管） circuits can amplify（放大） voltage signals with minimum waveform distortion（波形失真）. 下划线介词短语充当_。
答案: 状语
2、 The sound-carrying medium may be matter in any state. 下划线介词短语充当_。
答案: 定语
3、 The resistance of the load （负载）is too high for the amplifier（放大器）. 前后两个下划线介词短语分别充当_。
答案: 定语……状语
4、 A circuit may be defined as a path for current flow. 前后两个下划线介词短语分别充当_。
答案: 补语……定语
5、 Alternating current（交流电） as a source of power has certain advantages over direct current（直流电）. 前后两个下划线介词短语分别充当_。
答案: 状语……状语
6、 _ further increasing quantum-well（量子阱） number, the increase of the emission energy（发射能量） becomes slow.
答案: With
7、 A simple approach _ expressing a function（函数） is shown _ Fig. 4-1.
答案: to……in
8、 _ this case the velocity of an object varies linearly （线性地） __ the time.
答案: In……with
9、 We can easily see from the definition （定义） of k _ the ratio of a force _ a length that the unit of elastic potential energy （弹性势能） is the same as the unit of work （功） .
答案: as……to
10、 The two balls move _ the opposite directions _ the same stress（应力）.
答案: in……under
11、 There is a great demand _ these devices. （填入一个恰当的介词，使句意通顺。）
答案: for
分析：介词for和名词demand搭配，意思是“……的需求量”或“对……的需求”。
12、 _ analogy（类比） with Eq. (4), we have the scale factor（比例系数）.（填入一个恰当的介词，使句意通顺。）
答案: By
分析：By短语在本句中作方式状语，analogy在这里是动作性名词，表示动作“类比”，by在这里的意思是“通过（做某事）”。
13、 _ being compressed（压缩）, the volume of a substance will be reduced. （填入一个恰当的介词，使句意通顺。）
答案: (以下答案任选其一都对)On;
Upon
分析：On/Upon短语在本句中作条件状语，表示触发条件，意为“一……就”。
14、 _ more details on numerical techniques（数值方法） refer to Ref. [6-9]. （填入一个恰当的介词，使句意通顺。）
答案: For
分析：For短语在本句中作目的状语，这是科技英语中常见的一个句型，意为“要详细了解……，参见文献……”。
15、 These results have to be interpreted _ caution（谨慎）. （填入一个恰当的介词，使句意通顺。）
答案: with
分析：with后面接抽象名词caution作状语，意为“谨慎地，小心地”。
第三周 词类（III）形容词及副词、代词、名词 单元测验三
1、 Both m and n are therefore even, to our choice of m and n.
答案: contrary
2、 In cellular systems, covering the area is generally divided into a plurality of cells to cellular.
答案: similar
3、 Super pixels have emerged as a form of over-segmentation meant to provide clusters of perceptually similar pixels throughout an image, thus capturing the redundancy in most natural images.
答案: inherent
4、 In practice, a lot of limitations arise to the correlation of antennas and hardware impairments.
答案: due
5、 栅极之所以能做到这点，主要是由于它非常靠近阴极。The grid is able to do this primarily because of __to the cathode.
答案: its great proximity
6、 艾肯机的速度受到了限制，因为它使用的是继电器而不是电子器件。Aiken’s machine was limited in speed rather than electronic devices.
答案: by its use of relays
7、 由于变压器体积大、重量重、价格昂贵，所以把它们从电路中去掉能节省不少费用。Since transformers are large, heavy, and expensive, results in considerable savings.
答案: their elimination from the circuit
8、 ______ 2.5 and 2.6 show two special kinds of robot.
答案: Figs.
9、 This ______ must be kept within accepted limits, or the diode will suffer physical damage.
答案: temperature rise
10、 A major application of the diode is in the production of a dc voltage from an ac supply, ______ as rectification.
答案: a process referred to
11、 to the K-medoids method（与K-medoids聚类算法类似）, it has its basis only in the distance between data points.
答案: Similar
12、 to all other oscillator transfer techniques（和其它所有振荡器转换技术一样）, the phase-locked mode cannot be used for pulsed inputs.
答案: Common
13、 据估计，在太阳存在的50亿年期间，太阳核已用掉了其原来存储氢气的一半。It is estimated that during the 5 billion years of ______, the core of our sun has used about half of its original supply of hydrogen.
答案: its existence
14、 在这种情况下，就会有溢出出现，而在本节后半部分会讨论对它的检测。In this case, overflow can occur, and ____is discussed later in this section.
答案: its detection
15、 RAM硬盘的内容完全是由用户控制的。The contents of the RAM disk are totally ______.
答案: (以下答案任选其一都对)user controlled;
user-controlled
第四周 词汇搭配、句子成分 单元测验四
1、 A simple approach ______ a function（函数）is shown in Fig. 4-1.
答案: to expressing
2、 The variation of g with latitude is due ______ the earth’s rotation.
答案: in part to
3、 In this case, exposure of the body _____ sunlight helps to overcome anemia and stimulate metabolism.
答案: to
4、 The voltage __ the resistor changes instantaneously, as does the current ____ the resistor.
答案: across; through
5、 ______ for measuring electric resistance, the ohmmeter is widely used in electrical engineering.
答案: An instrument
6、 Steady electric current, ______ by the Italian physicist Allessandro Volta (1745-1827), can be produced by the electric cell.
答案: invented
7、 Evidence has been piled up ______ specific speech sounds are recognized by babies as young as five months old.
答案: that
8、 The decibel（分贝）is one tenth of a bel, ______ named after Alexander Graham Bell.
答案: a unit
9、 Television, ______ often said, keeps one informed about current events.
答案: it is
10、 ______ all other oscillator transfer techniques, the phase-locked mode cannot be used for pulsed inputs.
答案: Common to
11、 将来，这种设备的需求量将是现在的20倍。The ______ this kind of equipment in the future will be 20 times what it is.
答案: (以下答案任选其一都对)demand for;
need for
12、 温度对半导体电阻的影响必须考虑进去。The effect ______ the resistance of a semiconductor must be taken into account.
答案: of temperature on
13、 电阻器将电能转变为热能是一个不可逆的过程。The conversion ___ heat in a resistor is an irreversible process.
答案: (以下答案任选其一都对)of electrical energy to;
of electrical energy into
14、 电荷与电位之比称为物体的电容。The __ of charge to potential is called the capacitance of the body.
答案: ratio
15、 在这种情况下，物体的速度随时间呈线性变化。In this case, the velocity of an object ______ the time.
答案: (以下答案任选其一都对)varies linearly with;
changes linearly with
