各位电民，复习一下大学课程嘛。设计一个电路。要求按一次键产生一个与时钟脉冲高电平一样宽的单脉冲。

                   Vcc   +    +
                         |    |
                        +-+  +-+
                        | |  | |
                        | |  | |
                        +-+  +-+
                         |    |         +-------+
                D1       |    |         |       |
                O--------+----^---------|       |----------- z
             /                |         |       |
      +-----/                 |         |       |
      |                       |         |       |
      |         O-------------+---------|       |
      |         D2                      |       |
   =======                              |       |
     ===                        C ------|       |
      =                                 |       |
                                        +-------+
y3 = /C&Y3&Y2&Y1 + /C&D1&Y2&Y1 + C&D1&Y3&Y1 + C&Y3&/Y2 + C&/D1&/Y2&/Y1
y2 = /C&Y3&Y2 + Y3&/Y1 + D1&Y3&Y2 + C&/Y3&Y1
y1 = Y3&/Y2 + C1&/y3&Y1 + /Y2&Y1 + D1&Y1 + /C&/D2&/Y2 + C&/D1&/Y2
z = /Y3&Y2&Y1