单项选择题
A Doppler speed log indicates speed over ground（）.
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
点击查看答案&解析
相关考题
-
单项选择题
A Doppler log in the volume reverberation mode indicates（）.
A.speed being made good
B.speed through the water
C.the set of the current
D.the depth of the water -
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 -
单项选择题
A deadhead is a(n)（）.
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
