The cast iron _____ for the cross-head are attached to the top section and seal off the cr

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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 boxes

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。