单选题The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.Acylinder coverBcross-head shoesCguide-waysDscavenging boxes
单选题
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
参考解析
解析：
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