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

3.單項(xiàng)選擇題When the bearing becomes dry from lack of oil, the motor shaft may heat to （）an extent （） it welds itself to the bearing.

A.either；or
B.neither；nor
C.such；that
D.so；that

5.單項(xiàng)選擇題When a sudden increase in steam demand comes to normal, the drum pressure will and water level in the drum will（）.

A.rise, rise also
B.rise, drop
C.drop, rise
D.drop, drop also