A.卵石淺灘 B.沙質(zhì)淺灘 C.石質(zhì)淺灘 D.泥質(zhì)淺灘
A.0.5~1.0 B.0.8~2.0 C.2.0~3.0 D.3.0~4.0
A.枯水河床 B.枯水航道 C.中枯水河床 D.中枯水航道