/(0.0001/2) =数据太大了,超出范围
/(0.0051/2) =14.142135623731
/(0.0101/2) =10
/(0.0151/2) =8.16496580927726
/(0.0201/2) =7.07106781186548
/(0.0251/2) =6.32455532033676
/(0.0301/2) =5.77350269189626
/(0.0351/2) =5.34522483824849
/(0.0401/2) =5
/(0.0451/2) =4.71404520791032