法兰部件，消声器，管端闭锁或联结装置及其形成方法和装置。

Flange member, noice silencer, tube end closure or connection device, and forming method and device.

youdao

法兰部件，消声器，管端闭锁或联结装置及其形成方法和装置。

Flange member, noice silencer, tube end closure or connection device, and forming method and device.

youdao