单项选择题
A.3 B.4 C.5 D.6
A.Fb/SoB.πd2/4C.abD.（Lu-L0）/L0×100%
A.0.8mm B.1mm C.1.5mm D.0.5mm
A.热轧带肋钢筋 B.热轧光圆钢筋 C.热轧钢带 D.冷轧钢带
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