问题
单项选择题
误码率是指二进制码元在数据传输系统中被传错的______。
A.比特数
B.字节数
C.概率
D.速率
答案
参考答案:C
解析:[知识点] 数据通信技术基础[评析] 误码率是指二进制码元在数据传输系统中被传错的概率。
误码率是指二进制码元在数据传输系统中被传错的______。
A.比特数
B.字节数
C.概率
D.速率
参考答案:C
解析:[知识点] 数据通信技术基础[评析] 误码率是指二进制码元在数据传输系统中被传错的概率。
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常温下,有下列四种溶液:
① | ② | ③ | ④ |
0.1mol/L NaOH溶液 | pH =" 11" NaOH溶液 | 0.1mol/L CH3COOH溶液 | pH =" 3" CH3COOH溶液 |
下列说法正确的是 ( )
A.由水电离出的c(H+):①>③
B.③稀释到原来的100倍后,pH与④相同
C.②与④混合,若溶液显酸性,则所得溶液中离子浓度可能为:
c(CH3COO-)>c(H+)>c(Na+)>c(OH-)
D.①与③混合,若溶液pH = 7,则V(NaOH)>V(CH3COOH)