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【单选题】
LTE FDD（Frequency Division Duplexing，FDD）采用的是（）
A.
频分双工
B.
时分双工
C.
码间干扰
D.
多址干扰
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元素 a[5]的地址
B.
元素 a[5]的值
C.
元素 a[6]的值
D.
元素 a[6]的地址
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