單項選擇題

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

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

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單項選擇題

（） is used to produce electric power.

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

單項選擇題

The system will include various （） such as low tank level alarms and remote operation of tank outlet valves in the events of a fire.

A.Switches
B.panels
C.alarm units
D.safety devices

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