发布时间:2025-01-31 05:17:02
HRB400E、HRB400,都是三级螺纹钢,屈服强度标准值400MPa,E类是特殊镇静钢
HRB500为四级螺纹钢,屈服强度标准值500MPa
盘圆Q235和HPB235都是光圆钢筋,屈服强度标准值235MPa
HPB300是屈服强度标准值300MPa的光圆钢筋
我的美的豆浆机买了还没用就坏了条码是1012082099怎么看这生产日期我朋友也是维修电器的说是20
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