单选题A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.A3 hoursB6 1/2 hoursC12 1/2 hoursD25 hours
单选题
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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