A.24.43 B.21.6 C.20.2 D.不取值
A.水泥:砂:石=1:2.2:4.4 B.水泥:砂:石=1:2.29:5.61 C.水泥:砂:石=1:2.29:4.49 D.水泥:砂:石=1:2.66:4.61
A.0.05% B.0.1% C.0.15% D.0.2%