A.1~3 B.3~5 C.2~3 D.3~4
A.1 B.2 C.3 D.4
A.85% B.80% C.75% D.70%
A.10% B.12% C.15% D.3%
A.喀斯特 B.砂岩 C.花岗岩 D.红土层