代码搜索：LED显示
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led
#include"reg52.h"
sbit led1=P2^4;
sbit led2=P2^5;
sbit led3=P2^6;
sbit led4=P2^7;
sbit key1=P3^2;
sbit key2=P3^3;
sbit key3=P3^4;
sbit key4=P3^5;
sbit beep=P2^0;
void delay(int t);
void mai