短語詞組短語piston oil ring groove 活塞油環(huán)槽piston ring oil hole 活塞環(huán)油孔PISTON RING OIL 油環(huán)組合slotted oil piston ring 開槽活塞油環(huán)flexible oil piston ring 撓性油環(huán)oil piston ring 活塞油環(huán);油環(huán)flexline oil piston ring 撓曲線活塞刮油環(huán)cromflex oil piston ring 鋼制帶脹圈的活塞環(huán)conformable oil piston ring 活塞撓性油環(huán) 返回 piston oil ring