单项选择题
A.at all times B.in the bottom return mode C.in the volume reverberation mode D.only when there is no current
A Doppler log in the volume reverberation mode indicate...
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
A Doppler log in the bottom return mode indicates the（）...
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
A deadhead is a(n)（）.A.tree or log awash in a nearly ve...
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
