题目内容

Mauna Kea is deemed as an ideal astronomical site due to

A. its geographical features
B. its protective surroundings.
C. its religious implications.
D. its existing infrastructure.

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A.calculatedB.deniedC.doubtedD.imagined

A. calculated
B. denied
C. doubted
D. imagined

电压在()伏以上和由于绝缘损坏可能带有危险电压的电气设备的金属外壳、构架、铠装电缆的钢带、屏蔽保护套等必须有保护接地。

A. 30
B. 37
C. 36
D. 35

A.devotedB.exposedC.lostD.attracted

A. devoted
B. exposed
C. lost
D. attracted

电动机的电压数动不得超过额定电压的（）

A. 8%—10%
B. 5%—10%
C. 10%—15%
D. 37%—15%