题目内容：
MCS51单片机RST上持续2个时钟周期的什么电平，系统复位：（）A．高电平
B．低电平
C．上升
D．下降
参考答案：【答案仅供学习，请勿对照自行用药等】
单选：MCS51单片机RST上持续2个时钟周期的什么电平，系统复位：（）
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- 题目类型：单选
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A．高电平
B．低电平
C．上升
D．下降
A．高电平
B．低电平
C．上升
D．下降
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The English language we know today is about six hundred years old. For half that
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