通过贝塞尔函数求出方程零点，解决不连续等小电容的求解问题，可以加深对贝塞尔函数的理解以及对m语言的认识-Through the Bessel function to find the zero point of the equation, to solve the problem of solving small capacitors such as discontinuities, we can deepen the understanding of the Bessel function and the understanding of m language