The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin（）<br>A:TBO<br>B:CEO<br>C:CFO<br>D:MCR

The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin（）
A:TBO
B:CEO
C:CFO
D:MCR

出自：海船船员证

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