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【单选题】
按各触发器的状态转换与时钟输入CP的关系分类,计数器可分( )计数器。
A.
同步和异步
B.
加计数和减计数
C.
二进制和十进制
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【简答题】c________ v. 证实,肯定;确认
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正确
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