单选题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）Atop of the ring grooveBback of the ring grooveCbottom of the ring grooveDpiston ring end clearance
单选题
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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