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


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1.單項選擇題The speed of an ocean current is dependent on().

A.the density of the water
B.the air temperature
C.the presence of a high pressure area near it
D.underwater soil conditions

2.單項選擇題The set of the ocean current is caused by().

A.density differences of the water
B.rotation of the earth
C.direction of primary circulation of air
D.all of the above

3.單項選擇題The set of the equatorial countercurrent is generally to the().

A.north
B.east
C.southwest
D.northwest

4.單項選擇題The set of the current is the().

A.speed of the current at a particular time
B.maximum speed of the current
C.direction from which the current flows
D.direction in which the current flows

5.單項選擇題The north equatorial current flows to the().

A.east
B.northeast
C.southwest
D.west