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單項選擇題

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

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單項選擇題

The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.

A.temperature
B.density
C.deflection
D.speed

單項選擇題

The velocity of the current in large coastal harbors is（）.

A.predicted in Tidal Current Tables
B.unpredictable
C.generally constant
D.generally too weak to be of concern

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