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ASTM A516 GR70材料的化学成分和机械性能参数--[请教] |
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发表于 2007-4-12 21:51:55
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Re: ASTM A516 GR70材料的化学成分和机械性能参数--[请教]
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发表于 2008-10-27 10:23:18
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A516 Gr70等的化学成份
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