问题描述：
[单选]
The pistons are cooled by oil supplied from the forced（）system．
A．fresh water
B．sea water
C．lubrication
D．fuel oil
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答案解析：无
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上一篇：The piston moves up and down， thus causing the rotational movement of the（）
下一篇：The period when both inlet valves and exhaust valves are open is referred to as（）．
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