图1所示时序逻辑电路是一个（　　）。<br/> <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23819688_0.png"><br/> 图1附：触发器的逻辑状态表为：<br/> <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23819688_0_1.png">