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【单选题】
单片机的时序是单片机运行过程中的一些基本时间概念，下面说法 不正确 的是‍
A.
状态周期=2*振荡周期
B.
单片机振荡频率越高，单片机工作越快
C.
指令周期是单片机执行一条指令所花的时间，它是固定的
D.
机器周期=12*振荡周期
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