多项选择题
A.排水 B.支挡 C.卸载 D.反压
A.a1-2<0.1MPa-1、0.1MPa-1≤a1-2<0.5MPa-1、a1-2≥0.5MPa-1 B.a1-2≥0.5MPa-1、0.1MPa-11≤a1-2<0.5MPa-1、a1-2<0.1MPa-1 C.a1-2<0.5MPa-1、0.5MPa-1≤a1-2<1.0MPa-1、a1-2≥1.0MPa-1 D.a1-2≥1.0MPa-1、0.5MPa-1≤a1-2<1.0MPa-1、a1-2<0.5MPa-1
A.10m~50m B.50m~100m C.20m~120m D.100m~180m