钢管和管件有两种标准端部型式，即：法兰和丝扣。
Two types of end are standard on steel pipes and fittings, that is flanged and screwed.
钢管和管件有两种标准端部型式，即：法兰和丝扣。 。
Two types of end are standard on steel pipes and fittings, that is flanged and screwed.
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.
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