Flange member, noice silencer, tube end closure or connection device, and forming method and device.
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。
The quick opening closure is a mechanical device which can open and close quickly.
快开盲板是一种能快速开启和关闭的机械装置。
The quick opening closure is a mechanical device which can open and close quickly.
快开盲板是一种能快速开启和关闭的机械装置。
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