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法兰闷盖是管道上不可缺少的零件之一。我厂的煤气管道、抽风管道(管道直径由φ300至φ1200mm)上,约有法兰闷盖850个,其中有近100
Flange bung is one of the indispensable parts of the pipeline. I plant gas pipe, exhaust pipe (pipe diameter from φ300 to φ1200mm), about flange cover boring 850, of which nearly 100