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ASTM A516 GR70材料的化學(xué)成分和機(jī)械性能參數(shù)--[請(qǐng)教] |
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Re: ASTM A516 GR70材料的化學(xué)成分和機(jī)械性能參數(shù)--[請(qǐng)教]
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A516 Gr70等的化學(xué)成份
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