设计滤波器时，可以输入相应要计算的值，自动计算频率，电容，电阻等。-Design filter, you can enter a value corresponding to the calculated automatically calculate the frequency, capacitance, resistance and so on.

利用VC++语言，计算地层的电阻率的实现。-Calculated using the VC++ language realization of formation resistivity