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【多选题】
网络规划时要求尽量站址分布符合蜂窝网络结构的要求，在具体落实的时候注意以下哪几点()A.
不影响基站布局的情况下，视具体情况尽量选择现有设施，以减少建设成本和周期;
B.
应避免选取对于网络性能影响较大已有的(站高大于70站高高于周边建筑物25米)，并通过在周边新选址或选用多个替换站点等方式保证取消后的覆盖质量;
C.
在市区楼群中选址时，可巧妙利用建筑物的高度，实现网络层次结构的划分;
D.
避免将小区边缘设置在用户密集区，良好的覆盖是有且仅有一个主力覆盖小区。
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