短语词组短语crank -case oils 又称曲轴箱油CRANK CASE GASTER 曲轴箱垫片type crank case 拼合式曲柄箱upper crank case 上机匣unsplit crank case 整式曲柄箱B CRANK CASE ASSY 汽缸体 返回 crank case