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單項(xiàng)選擇題

The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

A.the cylinder head
B.the cross-head
C.the moving piston
D.the stationary piston

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單項(xiàng)選擇題

The fourth engineer accompanied by the workers on oil barge measures the oil levels, temperature and （） in the tanks.

A.tank table
B.trim
C.water contents
D.oil pressure

單項(xiàng)選擇題

The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.

A.alternator
B.turbo-charger
C.remote controller
D.windlass