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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海洋学基本知识

A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.