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答:Ⅰ级:屈服235MPa,抗拉370MPa伸长率≥25%,±{;mM×ïbbs.3c3t.com1&>'Y5c
Ⅱ级:屈服335MPa,抗拉510MPa伸长率≥16%,±{;mM×ïbbs.3c3t.com1&>'Y5c,±{;mM×ïbbs.3c3t.com1&>'Y5c
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,±{;mM×ïbbs.3c3t.com1&>'Y5c[此贴子已经被作者于2007-1-24 11:24:56编辑过],±{;mM×ïbbs.3c3t.com1&>'Y5c
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