maple_lam的博客

在模拟及脉冲数字电路中，常常用到由电阻R 和电容C 组成的RC 电路，在这些电路中，电阻R 和电容C 的取值不同、输入和输出关系以及处理的波形之间的关系，产生了RC 电路的不同应用

The power of using aspheric lenses has been known for several centuries, starting with the formulas invented by Renee Descartes in the early 1600s. Although it was known that aspheric lenses had major advantages over their spherical counterparts, the cost and complexity of manufacturing them has limited their use in commercial and scientific applications.