In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded（） -题库考试答案搜索网

In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded（）

单选题

2022-01-04 19:29

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 edge

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正确答案

B

试题解析

标签：船舶电气与船舶安全

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