单项选择题
A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.
A.3 hours
B.6 1/2 hours
C.12 1/2 hours
D.25 hours
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A.dew
B.frost
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A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing，the water of（）.
A.high density will be on the left in the Northern Hemisphere
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A.at high vessel speeds
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