单项选择题
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
单项选择题 The speed of an ocean current is dependent on（）.
单项选择题 The set of the ocean current is caused by（）.
单项选择题 The set of the equatorial countercurrent is generally to the（）.
