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【单选题】
若公比为2且各项均为正数的等比数列 中， ，则 的值等于（ ）A.
2
B.
4
C.
8
D.
16
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【单选题】某数字通信系统的码元速率为 1200Baud ,接收端在半小时内其接收到 216 个错误码元,则该系统的误码率为( )
A.
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B.
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C.
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D.
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