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All the rings are slightly rounded on their extern...

海船船员考试

单选题

All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

发布日期：2021-03-22

A.the running-in period

B.the running process

C.gas exchange process

D.the boiler firing

标签： rings slightly rounded external top

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