A.1:1-1:2; B.1:2-1:3; C.1:3-1:4; D.1:3-1:5;
A.坐北朝南; B.坐南朝北; C.由東向西; D.由西向東
A.2000-300m; B.3000-4000m; C.4000-5000m; D.7000-8000m