A.5~10m B.10~15m C.15~20mm D.20~25m
A.最低設(shè)計(jì)水位之下1~3m B.最低允許地下水位之下1~3m C.最低設(shè)計(jì)水位之下3~5m D.最低允許地下水位之下3~5m
A.1~2m B.2~3m C.2~5m D.3~6m