ASTM A500/A500M-09 Standard Specification for Cold-Formed Welded and Seamless
leunghb · 2010-01-08 14:53 · 50985 次点击
ASTMA500/A500M-09StandardSpecificationforCold-FormedWeldedandSeamlessCarbonSteelStructuralTubinginRoundsandShapes
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