單項選擇題

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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單項選擇題

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

A.chute
B.stabilized channel
C.slough
D.navigable pass

單項選擇題

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

A.3 hours
B.6 1/2 hours
C.12 1/2 hours
D.25 hours

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A snag or other underwater obstruction may form a（）.

你可能感興趣的試題

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

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