A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.<br>A:3 hours<br>B:6 1/2 hours<br>C:12 1/2 hours<br>D:25 hours

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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