A.65 B.60 C.55 D.50
A.密实土层 B.粘土层 C.岩土层 D.粗粒土层
A.0.1；0.1-0.2 B.0.2；0.3-0.4 C.0.3；0.3-0.4 D.0.4；0.1-0.2
A.10-20 B.20-30 C.30-40 D.40-50
A.75° B.65° C.45° D.55°
