單項(xiàng)選擇題當(dāng)測(cè)定冷拉率時(shí),如鋼筋的強(qiáng)度偏高,平均冷拉率小于1%時(shí),按()進(jìn)行冷拉。A.0.5%B.按實(shí)際冷拉率C.1%

A.±5mm
B.±10mm
C.±15mm
D.±20mm