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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1.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
2.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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