你可能感興趣的試題

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

單項(xiàng)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