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代码说明：

说明：  这是购买周立功的试验箱时候松的源代码。很经典的代码。希望学习单片机的朋友好好研究。短小精悍。有意思。这是第二部分。(This is the purchase of weeks Ligong Song of the chamber when the source code. Classic code. Singlechip friends want to learn on this issue. Dapper. Interesting. This is the second part.)