Power supply development is a technical and tiring job. When the work is complicated, it is inevitable to make some low-level mistakes. These mistakes will lead to a series of chain reactions, and man
[size=4]In life, you might as well stand on tiptoe more often. The method is: put your feet together on the ground, stand on your heels, and then relax. Repeat 20-30 times. It has a good fitness effec