2245| 5
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熟悉金屬材料力學(xué)性能的朋友請來幫下忙 |
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點(diǎn)評
老兄,請教下,,以Q235為例,,他的抗拉強(qiáng)度為380~470MPa,怎么理解這個(gè)范圍值呢?就是說什么時(shí)候取下限,,什么時(shí)候取上限,?
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