A.采用錐型絞刀和長(zhǎng)塵齒,順流施工B.采用錐型絞刀和長(zhǎng)尖齒,逆流施工C.采用冠型絞刀和方齒,順流施工D.采用冠型絞刀和方齒,逆流施工
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