A.20min B.30min C.1h D.2h
A.38.1% B.38.4% C.42.1% D.46.6%
A.0 B.0.3 C.0.5 D.1.0
A.含水率 B.密度 C.抗剪強(qiáng)度 D.壓縮系數(shù)