A.井眼 B.斷鼻 C.凹陷 D.盆地
A.>80%;<5.0‰;100% B.>85%;<5.0‰;100% C.>70%;<5.0‰;100% D.>70%;<10.0‰;90%
A.>90% B.>80% C.>85% D.>75%