I recently read in the news that many companies such as JD.com and Alibaba have announced layoffs, which gives people the feeling that the current domestic economic cycle is not as good as before. Com
Division of the electromagnetic spectrum:
1. Very low frequency (VLF) 3 kHz~30 kHz, corresponding to the wavelength of electromagnetic waves is very long wave 100 km~10 km;
2. Low frequency (LF) 30 kH
[i=s]This post was last edited by 1nnocent on 2021-10-21 20:58[/i]The question is as shown in the picture. Picture 2 is the reference answer. The answer seems to be wrong.The answer to "1" seems to ha
[i=s]This post was last edited by zengyi703 on 2020-3-14 11:38[/i]I was bored at home during the epidemic, so I made a small board that supports MicroPython. Basic hardware functions:
1. The microcont