问题描述:
[单选]
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.windla
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下一篇:The four strokes are called suction, compression, expansion and exhaust, but only()stroke provides the power to drive the ship.
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