科技英语语法习题以及答案.doc

练习 1 I、将下列句子译成汉语，注意句中有些冠词的特殊位置： 1. In this case the current（电流）exists for only half the cycle（周期）. 2. In such a case there is no current flowing in the circuit（电路）. 3. Sensitivity（灵敏度）is a measure of how small a signal（信号）a receiver（接收机）can pick up and amplify（放大）to a level useful for communications. 4. ε may be as small a positive constant as you please. 5. Even so fundamental a dimension（量纲）as time was measured extremely crudely with sand and water clocks hundreds of years ago. 6. Nonlinear distortion（非线性失真）can be caused by too large an input signal. 7. The method used is quite an effective one. 8. A series（级数）solution of this kind of problem allows as close a calculation of the error as needed. II、将下列句子译成汉语，注意句中“and”和“or”的确切含义： 1. Air has weight and occupies space. 2. In this way less collector dissipation（集电极功耗）results, and the efficiency increases. 3. We can go one step farther and take into account the nonzero slope of the actual curves. 4. Try hard, and you will work the nut（螺母）loose. 5. The first step in analyzing a physical situation is to select those aspects of it which are essential and disregard the others. 6. This satellite was used for communications between the United States and Great Britain, France and Italy. 7. Some physical quantities require only a magnitude and a unit to be completely specified. Thus it is sufficient to say that the mass of a man is 85 kg, that the area of a farm is 160 acres, that the frequency of a sound wave is 660 cycles/sec, and that a light bulb consumes electric energy at the rate of 100 watts. 8. Geothermal energy, or energy from within the earth, can be used to generate electricity. 9.The current in a capacitor（电容器）leads（导前）the voltage by 90o, or, the voltage lags the current by 90o. 10. The message is a logical unit of user data, control data, or both. III、将下列句子译成汉语，注意句中分数和倍数的正确译法： 1. By varying VBE only a few hundredths of a volt, the base current（基极电流）can be changed significantly.