A.20mm,15mm B.30mm,20mm C.30mm,25mm D.25mm,20mm
单项选择题某一组强度等级为MU10的混凝土多孔砖的抗压强度数值如下:15.6MPa,11.6MPa,13.1MPa,8.0MPa,9.5MPa,8.9MPa,12.8MPa,11.8MPa,10.6MPa,13.8MPa。采用()评定强度。
A.最小值 B.标准值 C.平均值—最小值 D.平均值—标准值