A.花崗巖、石膏巖、鐵礦巖 B.大理石,礫巖,玄武巖、白云巖 C.石英砂巖、風(fēng)化巖、煤層
A.230Ω B.90Ω C.110Ω
A.1-3°/FT.BUR B.10-20°/100FT.BUR C.2-6°/100FT.BUR