短語詞組短語piston oil ring 活塞油環(huán)piston compression ring 活塞壓縮環(huán)piston guard ring 活塞護(hù)環(huán)wiper piston -ring 刮油活塞環(huán)piston valve ring 活塞閥填密環(huán);變量閥環(huán)Piston sealing ring 活塞密封圈piston and ring 活塞和活塞環(huán)piston packing ring 活塞脹圈;活塞填料環(huán);活塞環(huán)equalizing piston packing ring 平衡活塞密封圈 返回 piston ring