基本解释[交通运输工程]摇臂罩词组短语短语valve rocker arm cover 气门摇臂室盖rocker arm cover bolt 摇臂罩螺栓rocker arm cover nut 摇臂罩螺母rocker arm cover base 摇臂罩底座valve -rocker arm cover 气门摇臂盖壳专业释义交通运输工程摇臂罩