题目内容

将空缺的语句补充完整。(①)//52系列单片机头文件#defineuintunsignedint//宏定义sbitled1=P1^0;//声明单片机P1口的第一位uinti,j;voidmain(){//主函数while(1){//大循环led1=0;/*点亮第一个发光二极管*/for(i=1;i>0;i--)//延时for(j=110;j>0;j--);led1=1;/*关闭第一个发光二极管*/for(i=1000;i>0;i--)//延时for(j=110;j>0;j--);}}

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CD4511七段显示译码器可以驱动共阳显示器。

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A. is
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A. in
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A. for
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