In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded（）<br>A:on both the external and internal top edges<br>B:on both the external top and bottom edges<br>C:on both the external and internal bottom edges<br>D:on all the four edges

In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded（）
A:on both the external and internal top edges
B:on both the external top and bottom edges
C:on both the external and internal bottom edges
D:on all the four edges

出自：海船船员证

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