A 对 B 错 答案 对 In the communication process, there are mainly 7 elements speaker, listener, channel, message, feedback, 点我阅读全文
实现无线通信的MicroPython库是( )。 A:radio B:microbit C:random D:music 答案: radio定义无线电的“频道”是( )。 A:channel B:frequency C:group D:po 点我阅读全文