The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.
- Acylinder cover
- Bcross-head shoes
- Cguide-ways
- Dscavenging boxe
问题
The cast iron（）for the cross-head are
参考解析：
分类：船舶动力装置题库,海船船员考试题库
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