The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.<br>A:cylinder cover<br>B:cross-head shoes<br>C:guide-ways<br>D:scavenging boxes

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

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