短語詞組短語liquid piston fibrous packing ring 液缸活塞纖維填料環(huán)equalizing piston packing ring 平衡活塞密封圈piston ring packing detail 活塞環(huán)密封piston ring packing 活塞環(huán)密封split -ring piston packing [機(jī)]開環(huán)式活塞脹圈 返回 piston packing ring