單項(xiàng)選擇題

Shore power must be（） during dock repair.

A.disconnected
B.switched off
C.cut off
D.connected

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單項(xiàng)選擇題

The coil of wire rotating in the magnetic field produces the（）.

A.voltage
B.current
C.power
D.frequency

單項(xiàng)選擇題

（） is used to produce electric power.

A.An alternator
B.fresh water generator
C.A compressor
D.A clarifier

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