【单选题】
______you choose, make sure that it is a good one. ___
A. What
B. Wherever
C. Whichever
D. Which
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答案
C
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A. 10m 以内
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C. 30m 以外
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【单选题】
缘棒平时应___
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A. 变大
B. 变小
C. 不变
D. 无法判定
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当电缆在地下铺设时,其两端均应接地,高压电缆在任何情况下都要接地
A. 对
B. 错
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直流电流表可以用于交流电路。
A. 对
B. 错
【判断题】
钳形电流表可做成既能测交流电流,也能测量直流电流。
A. 对
B. 错
【判断题】
使用万用表测量电阻,每换一次欧姆档都要把指针调令一次。
A. 对
B. 错