▍1. zuse
验证阻塞赋值与非阻塞的赋值赋值过程的先后顺序(Verification of the order of assignment and non blocking assignment)
电子时钟,可以显示四位,两位显示分钟,两位显示秒,可以用按键控制清零,以及加减数(Electronic clock, you can display four bit, two bit display minutes, the second display seconds, can be used to control the key to clear, and the addition of subtraction)