Broken piston rings manifest themselves during the scavenge port inspection by（）
- ALack of elastic tension, when the rings are pressed into the groove by means of a stick
- BBlackish appearance
- CFractured rings and missing rings
- Dall off the above
问题
Broken piston rings manifest themselve
参考解析：
分类：船舶电气与船舶安全题库
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