In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）<br>A:top of the ring groove<br>B:back of the ring groove<br>C:bottom of the ring groove<br>D:piston ring end clearance

In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）
A:top of the ring groove
B:back of the ring groove
C:bottom of the ring groove
D:piston ring end clearance

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