单项选择题

A Doppler log in the bottom return mode indicates the（）.

A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground

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单项选择题

A.tree or log awash in a nearly vertical position
B.crew member who refuses to work
C.upstream end of a land wall
D.buoy that is adrift

单项选择题

A.high pressure system
B.low pressure system
C.high dew point
D.low dew point

单项选择题

A.At
B.In
C.During
D.With