(1)什么是单片机?单片机有何作用?
(2)单片机的内部结构。实验板上有哪些器件?大致有何作用? K6vp57ReQIUlIgRYqfNcg98mLC8GwMZHHvnLFv2o5confJ9uR8ZZlfVrfP27roRc