短语词组短語piston compressor ring valve 壓縮機環狀閥supply valve piston ring [鉄路]供給閥鞲韝漲圈large main valve piston ring 主閥大活塞環Main valve piston large ring 主閥鞲韝大漲圈Piston Ring for Control Valve 控制閥用活塞環 返回 piston valve ring