单项选择题
A.the cylinder head B.the cross-head C.the moving piston D.the stationary piston
The fourth engineer accompanied by the workers on oil b...
单项选择题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
The four-stroke engine is used for （） and sometimes for...
单项选择题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
The four strokes are called suction, compression, expan...
单项选择题The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.
A.suction B.compression C.expansion D.exhaust
