短語詞組短語oil l scraper ring 刮油圈oil scraper piston ring 刮油活塞環(huán)slotted oil scraper ring 開槽刮油環(huán)grooved drum oil scraper ring 開槽油環(huán)twin -rail oil scraper ring 雙片刮油環(huán) 返回 oil scraper ring