问题描述：
[单选]
The cast iron guide-ways for（）are attached to the top section and seal off the crankcase．
A．the connecting rod
B．the cross-head
C．the piston rod
D．the air box
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答案解析：无
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上一篇：The cleaned heated oil， after passing through the centrifuges， is to be pumped to a（）．
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