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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答案解析：无
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上一篇：The fourth engineer accompanied by the workers on oil barge measures the oil levels， temperature and（）in the tanks．
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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