单项选择题

A stretch where the channel changes from one side of the river to the other is called a（）.

A.crossing
B.transit
C.transfer
D.passing

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单项选择题A snag or other underwater obstruction may form a（）.

A.V-shaped ripple with the point of the V pointing upstream
B.V-shaped ripple with the point of the V pointing downstream
C.small patch of smooth water on a windy day
D.smoothing out of the vessel's wake

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单项选择题A section of the river that is narrower than usual and is often navigable from bank to bank is a（）.

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A rotary current sets through all directions of the com...

单项选择题A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.

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D.25 hours

海洋学基本知识

A stretch where the channel changes from one side of the river to the other is called a（）.