单项选择题
A.0.20-1.5 B.0.25-2.0 C.0.25-1.5 D.0.20-2.0
A.mfcu≥fcu，k，fcu，min≥0.85fcu，k B.mfcu≥1.05fcu，k，fcu，min≥0.85fcu，k C.mfcu≥fcu，k，fcu，min≥0.95fcu，k D.mfcu≥1.15fcu，k，fcu，min≥0.95fcu，k
A.20±5℃ B.20±4℃ C.20±3℃ D.20±2℃