单项选择题
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
A.doldrums B.horse latitudes C.trade winds D.prevailing westerlies
单项选择题 The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
单项选择题 The velocity of the current in large coastal harbors is（）.
单项选择题 The velocity of a rotary tidal current will be decreased when the Moon is（）.
