- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
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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