A.自上游向下游,先深水后淺水B.自上游向下游,先淺水后深水C.自下游向上游,先深水后淺水D.自下游向上游,先淺水后深水
A.洲頭順壩B.洲尾順壩C.洲頭丁壩D.洲尾丁壩
A.由岸向水域分層進(jìn)行B.由水域向岸分層進(jìn)行C.控制樁兩側(cè)拋填高差D.沿樁周圍對(duì)稱拋填