短語詞組短語piston compressor ring valve 壓縮機環(huán)狀閥supply valve piston ring [鉄路]供給閥鞲韝漲圈large main valve piston ring 主閥大活塞環(huán)Main valve piston large ring 主閥鞲韝大漲圈Piston Ring for Control Valve 控制閥用活塞環(huán) 返回 piston valve ring