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篮球运动始于（）年12月。
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Comparing with an analog signal assuming a continuous range of values, a digital signal assumes discrete values, usually two permitted value.
Computers are constructed of digital building blocks such as logic gates, flip-flops and counters.
The output of XOR is 1 if one input is 1 and the other is 1.
The NAND, NOR and XOR are sequential logic, while the D flip-flop and JK flip-flop are combinational logic.
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