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问题 单项选择题

外指点标的辐射场是由（）音频调幅的，只用划来编码，速度为每秒（）划。

A.400HZ   2

B.1300HZ   2

C.400HZ   6

D.3000HZ   2

答案

参考答案：A

选择题

Not until one of his works was published_________to gain his confidence in writing. [ ]

A. he was able      

B. was he able        

C. he had been able  

D. had he been able
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单项选择题

以下关于IP城域网与数据承载网关系的说法，哪个最准确（）.

A、两者为并列关系，均可独立承载用户的数据业务

B、IP城域网就是CMNET的接入层

C、IP城域网就是IP专用承载网的接入层

D、IP城域网就是IP专用承载网和CMNET骨干网在本地网（城域范围）的延伸
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