Which of the following options is the frequency range supported by China 5GHz Frequency band()?
Answer(s): D
According to the different signal parameters controlled, what modulation methods can be divided into ()? (Select 3 Answers)
Answer(s): A,B,C
Which modulation method is the picture below ()?
Answer(s): B
What was the name of the first radio communication network based on packet technology ()?
Answer(s): C
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