A.2.0 B.2.5 C.3.0 D.3.5
A.>500 B.>600 C.>700 D.>800
A.C15(抗壓強(qiáng)度設(shè)計(jì)值fc=7.5MPa) B.C20(抗壓強(qiáng)度設(shè)計(jì)值fc=10MPa) C.C25(抗壓強(qiáng)度設(shè)計(jì)值fc=12.5MPa) D.C30(抗壓強(qiáng)度設(shè)計(jì)值fc=15MPa)