单项选择题
某电路需有效值为5mV的正弦波信号作为输入,可提供该信号的是()。
A.信号发生器
B.数字示波器
C.直流稳压电源
某电路需有效值为5mV的正弦波信号作为输入,可提供该信号的是()。
A.信号发生器
B.数字示波器
C.直流稳压电源
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单项选择题
Whatis wrong about the development of news?()
Whatis wrong about the development of news?()
A.After
the camera is widely used, the picture news will flourish.
B.After
the application of TV and camera, there will be live news.
C.The
emergence of VR technology will give birth to panoramic news.
D.Panoramic
news can be broadcast in the traditional way without new platform.