lybro 发表于 2009-7-23 08:56:46

ASTM A 178-2002电阻焊接碳素钢钢管及碳锰钢锅炉和过热器管

ASTM A 178-2002 Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes
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