题目内容
A 4-bit parallel-in/parallel-out shift register will store data for ().
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A 3-bit binary counter has a maximum modulus of ().
An asynchronous counter differs from a synchronous counter in ().
There are at least ()flip-flops for a modulus-12 counter.
A retriggerable one-shot with an active HIGH output has a pulse width of 20ms and is triggered from a 60 Hz line. The output will be a ().
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