All the rings are slightly rounded on their external top and bottom edges to keep the oil

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.

A.the running-in period

B.the running process

C.gas exchange process

D.the boiler firing

请帮忙给出正确答案和分析，谢谢！

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All the rings are slightly rounded on their external top and bottom edges to keep the oil

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