题目内容
Comparing with an analog signal assuming a continuous range of values，a digital signal assumes discrete values, usually two permitted values.
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The output of XOR gate is 1 if one input is 1 and the other is 1.
Computers are constructed of digital building blocks such as logic gates, Flip-Flops and counters.
A binary 4-bit synchronous counter is implemented using 4 JK flip-flops and 2 AND gates.
PLC在输入采样阶段，扫描所有输入端子，并将各输入状态存入相应的（ ）寄存器中。
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