斗渠(lateral canal)
I undertake to bring to the notice of the Suez Canal Authorities,before my vessel ______ the Canal,any defects which may appear.A.enters intoB.entersC.enters inD.enters to
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El Abbasa (Sweet Water) Canal______from River Nile at Cairo to Suez Canal at Ismaili.A.extendB.extendingC.are extendingD.extends
The canal must be wide enough to permit two of the largest boats using it to pass each other easily.It must be deep enough to leave about two feet of water( )the keel of the largest boat using the canal.A.down B.below C.beneath D.off
田间灌排渠系主要指()A干渠和支渠B支渠和斗渠C斗渠和农渠及其所围成的耕作田块内的临时渠道D干渠、支渠、斗渠和农渠四级渠道
斗渠
root canal
侧蚀作用(lateral erosion)