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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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單項(xiàng)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

單項(xiàng)選擇題

Electric insulation is made of organic substances and so gradually （） with age.

A.deteriorates
B.increases
C.are fouled
D.becomes better