回弹法检测单个构件混凝土强度下列各组计算数据正确的是( )
A.6个测区换算强度平均值33.5MPa,最小值29.3MPa,标准差1.20MPa,构件强度推定值为31.5 MPa B.10个测区换算强度平均值33.5MPa,最小值29.3MPa,标准差1.20MPa,构件强度推定值为29.3 MPa C.6个测区换算强度平均值33.5MPa,最小值29.3MPa,标准差1.20MPa,构件强度推定值为29.3 MPa D.10个测区换算强度平均值33.5MPa,最小值33.5MPa,标准差1.20MPa,构件强度推定值 为31.5 MPa正确答案D
