单项选择题
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
A barometer showing falling pressure indicates the appr...
单项选择题A barometer showing falling pressure indicates the approach of a（）.
A.high pressure system B.low pressure system C.high dew point D.low dew point
