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答:Ⅰ级:屈服235MPa,抗拉370MPa伸长率≥25%káç++ÉBÎbbs.3c3t.comæwÞÑ}ɽÃ
Ⅱ级:屈服335MPa,抗拉510MPa伸长率≥16%káç++ÉBÎbbs.3c3t.comæwÞÑ}ɽÃ
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