Ring groove inserts are occasionally used on aluminum alloy piston to（）
- Areduce the ring groove wear rate
- Bseal against crankcase vapors
- Clessen the wear on aluminum part of the cylinder
- Dallow for the greater expansion rate of aluminum
问题
Ring groove inserts are occasionally u
参考解析：
分类：船舶电气与船舶安全题库
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