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带有三十秒倒计时的四路抢答器。用multisim仿真的设计图。有一个主持人控制按钮，四个选手抢答按钮，还有一个复位按键-With thirty seconds countdown four Responder. With the the multisim simulation of the design. A host control buttons, four contestants answer button, and a reset button

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