Which of the following are the principles that neighboring district planning should follow? (Multiple Choice)

Which of the following are the principles that neighboring district planning should follow? (Multiple Choice)
A . The geographically directly adjacent cells are generally used as neighboring areas.
B. The neighboring areas generally require mutual neighboring areas, that is, the A sector carrier frequency uses B as the neighboring area, and B also needs A as the neighboring area.
C. For dense urban areas and ordinary urban areas, because the station spacing is relatively close, the neighboring areas should do more, but in general, the same frequency neighboring area cannot exceed 64, and the inter-frequency neighboring area and the different system neighboring area cannot exceed 32.
D. For base stations in suburban and suburban counties, although the station spacing is very large, it is necessary to use adjacent locations as neighboring areas to ensure timely switching and avoid call drop.

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Answer: ABD