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【单选题】
关于 LTE TDD 帧结构，哪些说法是正确的A.
每一个无线帧长度为 20ms ，由 20 个时隙构成。
B.
每一个半帧由 8 个常规子帧和 DwPTS 、 GP 和 UpPTS 三个特殊时隙构成
C.
TDD 上下行数据可以在同一频带内传输；可使用非成对频谱
D.
GP 越小说明小区覆盖半径越大
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