【简答题】
试画出下列触发器的输出波形 (设触发器的初态为0)。<br /> 1.<img src="https://nimg.ppkao.com/2019-04/caoguanchen/2019043016523792920.png?sign=90b00d0bde6a98bffaf37b8e93d6f9d1&t=62d707a4" /><br /> 2.<img src="https://nimg.ppkao.com/2019-04/caoguanchen/2019043016532171464.png?sign=f178c27437924964974b9eb53b8bc92c&t=62d707a4" /><br /> 3.<img src="https://nimg.ppkao.com/2019-04/caoguanchen/2019043016534732608.png?sign=f137a75bf15e2eee8da8e016dcce6057&t=62d707a4" />