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.<br>A:the running-in period<br>B:the running process<br>C:gas exchange process<br>D:the boiler firing

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

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