The piston rings if found worn out （） and supplied by shipchandler.
- Amust replace
- Bmust to be equipped
- Chas to be repaired
- Dhave to be renewed
问题
The piston rings if found worn out （）
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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4、The lowest ring of a piston is （）.
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6、The piston rings are manufactured with
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