單項選擇題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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1.單項選擇題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

2.單項選擇題The tide is（）.

A.black
B.setting
C.being
D.having

3.單項選擇題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

4.單項選擇題The term flood current refers to that time when the water（）.

A.is flowing towards the land
B.is moving towards the ocean
C.level is not changing
D.level is rising because of heavy rains

5.單項選擇題The steady current circling the globe at about 60°S is the（）.

A.Prevailing Westerly
B.Sub-Polar Flow
C.West Wind Drift
D.Humboldt Current