问题描述：
[单选]
The cooling of the piston is carried out by circulating（）across the underside of the crown and inside the ring belt or through specially shaped passages．
A．sea water
B．scavenging air
C．lubricating oil
D．fuel oil
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答案解析：无
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上一篇：The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed a（）．
下一篇：The cooling liquid used for the cylinder may be referred to as（）．
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