题目内容

It's never too late to learn, __________?

A. is it
B. isn't it
C. does it
D. doesn't it

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__________ is known to all that Shenzhou XII launched successfully.

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通信系统中一般规定语音信号所占的频带范围是（）。

A. 0～3400 Hz
B. 300～3400 Hz
C. 0～5 kHz
D. 0～8 kHz

多进制时，信息传输速率R与符号速率N之间存在确定的关系，其关系式是（）。

A. R=N
B. R=Nlog2M
C. R＞N
D. R＜N