出生医学证明软件，适合针式打印机使用，本单位一直在用！-Medical certificate of birth software for dot matrix printer, the unit has been using!

this is very good code to blink the screen of Mcontroller 8051

求解微分代数方程的应用代码，而且是隐微分方程，需要将其转化成矩阵形式-Application code for solving differential algebraic equations, and it is implicit differential equations, need to be translated into the form of matrix