问题描述：
[单选]
On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）
A．cooling jacket
B．cylinder liner
C．piston crown
D．cylinder cover
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答案解析：无
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上一篇：Once a fire is detected the engine should be slowed downOn no account（）．
下一篇：On the top of the cylinder is mounted the cylinder cover which is pressed onto（）of the cylinder liner by means of nuts and studs．
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