题目内容

用兆欧表测量绝缘电阻前要先切断被测设备的电源，并将设备的导电部分与大地接通，进行充分放电，以保证安全。

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当主驱动链被过度拉伸或断裂，主驱动链保护装置能使自动扶梯（自动人行道)停止运行。

Can the best student become （)？

A.as best as ever
B.as good as ever
C.better than ever
D.the best as ever

交流变压变频调速（VVVF)拖动电梯的调速原理是通过调节交流电机定子供电的幅值和频率而实现电动机的转速变化。

Whenever he appeared on the stage, the famous actor was greeted with a （) of applause from the audience.

A.piece
B.collection
C.number
D.burst