问题
选择题
某交流电电源电压的瞬时值表达式为u=6 sinl00πt（V），则下列说法中正确的是（ ）A．用交流电压表测该电源电压时，示数是6V B．用交流电压表测该电源电压时，示数是6 C．用此电源给电磁打点计时器供电时，打点的时间间隔为0.01s D．把标有“6V 3W”的小灯泡接在该电源上时，小灯泡将被烧毁 |
V
答案
答案：A
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| 某交流电电源电压的瞬时值表达式为u=6sinl00πt（V），则下列说法中正确的是（ ） A．用交流电压表测该电源电压时，示数是6V B．用交流电压表测该电源电压时，示数是6 C．用此电源给电磁打点计时器供电时，打点的时间间隔为0.01s D．把标有“6V 3W”的小灯泡接在该电源上时，小灯泡将被烧毁 |
答案：A
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| Tim was a 1 boy. He was not a very good student, and he did not like _2_ homework 3 he enjoyed doing other things in his free time. Usually, he did not do his homework and when he did it he always _4 a lot of mistakes. One day his math teacher 5 Tim's homework and saw that he got all his 6 right. He was very _7_ and rather (相当) _8_. He called Tim to his desk and said to 9 . "You got all your homework 10_ this time, Tim. _11_? Did your father help _12_?" Usually Tim's father helped him 13 his homework, but the evening before this, he had not been able to (能), because he _14_ at home that evening, so Tim answered, "No, sir, he was very busy last night, 15 I had to do it all by myself." | ||||
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