ErlangB 计算器： 1.时间阻塞率B(s,a)：double bsa_B(double a,unsigned long s) 2.中继线的条数s：unsigned long bsa_s(double a,double b) 3.呼叫量a：double bsa_a( double b,unsigned long s) ErlangC计算器 1.C(s,a)：double Csa(unsigned long s,double a)-ErlangB calculator: 1