单项选择题
The type of current which will have the greatest effect on the course made good for your vessel is（）.
A.one flowing in the same direction as your course steered
B.one flowing in the opposite direction as your course steered
C.one that flows at nearly right angles to your course steered
D.a rotary current in which the direction of current flow constantly changes
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相关考题
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单项选择题
The two most effective generating forces of surface ocean currents are（）.
A.temperature and salinity differences in the water
B.wind and density differences in the water
C.water depth and underwater topography
D.rotation of the Earth and continental interference -
单项选择题
The tide is（）.
A.black
B.setting
C.being
D.having -
单项选择题
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
A.falls／in
B.has been falling／on
C.has fallen／at
D.is falling／in
