题目内容
AT89C51单片机中特殊功能寄存器（SFR）使用片内RAM的部分字节地址。
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AT89C51单片机进入空闲模式，CPU停止工作。片内的外围电路（如中断系统、串行口和定时器）仍将继续工作。
According to the president, what did the parents remind their children to do before they left for college?
What does the president mean when he says “sample them widely” (Para. 5)?
What could be the consequences if you don’t challenge yourself?
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