單項選擇題
A.稍大于 B.等于 C.小于
A.先挖中段,再挖未段 B.先挖未段,再挖中段 C.兩端頭開挖
A.洪水期 B.枯水期 C.雨季
A.30~50m B.50~100m C.100m
A.下游向上游 B.上游向下游 C.中間
A.15m B.20m C.30m
A.10~30m B.10~15m C.20~30m
A.24h B.36h C.48h
A.70 B.80 C.90
A.2d B.3d C.7d
A.0.1 B.0.2 C.0.3