A.135 B.140 C.145 D.150
A.21.4 B.18.0 C.22.3 D.18.5
A.43.2 B.41.6 C.44.9 D.40
A.砂率 B.水灰比 C.骨料性能 D.(A+B+C)
A.656 B.632 C.660 D.566