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.
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.
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