问题描述：
[单选]
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
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答案解析：无
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上一篇：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．
下一篇：The fine filters will be arranged（）one can be cleaned while the other is operating．
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