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

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單項選擇題

The set of the equatorial countercurrent is generally to the（）.

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

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