2453| 5
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熟悉金屬材料力學(xué)性能的朋友請(qǐng)來(lái)幫下忙 |
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點(diǎn)評(píng)
老兄,請(qǐng)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(shuō)什么時(shí)候取下限,什么時(shí)候取上限?
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