单项选择题
A.1:50~1:200 B.1:200~1:500 C.2000或1:5000 D.1:20000
A.1:1000~1:5000 B.1:200~1:500 C.1:2000或1:5000 D.1:20000
A.地质构造复杂程度 B.断层 C.火成岩 D.煤层顶板