问题描述：
[单选]
The cast iron（）for the cross-head are attached to the top section and seal off the crankcase．
A．cylinder cover
B．cross-head shoes
C．guide-ways
D．scavenging boxe
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答案解析：无
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上一篇：The common method of applying oil to the cylinder walls is by means of small pump assembled in units， known as（）．
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