The longest river in Canada is()
A、the Mackenzie
B、the St.Lawrence
C、the Severn
D、the Yukon
A、the Mackenzie
B、the St.Lawrence
C、the Severn
D、the Yukon
A、the Severn and the Clyde B、the Thames and the Clyde C、the Clyde and the Humber D、the Severn and the Thames
A、A.toward the inside of the bend B、B.toward the outside of the bend C、C.toward the center of the river just before the bend,then change course for the river's center after the bend D、D.in the river's center
A、the Hudson River B、the Mississippi River C、the Missouri River D、the transcontinental railway
A、the minimum depth of the river prescribed in the channel maintenance program B、the edge of a dredged channel C、the highest level to which the river may rise without flooding D、the least available water in a channel which limits the draft of boats and tows
A、vessels ascending the river B、vessels descending the river C、all vessels ascending and descending the river D、None of the above