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單項(xiàng)選擇題

Tools with （）handles should be used to check electric circuit.

A.plastic
B.metal
C.stainless steel
D.copper

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單項(xiàng)選擇題

Before doing maintenance on electrical equipment, you should （）.

A.turn off power first
B.turn on power first
C.with a test pen in hand
D.tell C/E

單項(xiàng)選擇題

While the parallel operation, （） must be used.

A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C

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