/// <summary>
/// 设置精度
/// </summary>
/// <param name="n1">角度保留到小数点后的位数</param>
/// <param name="n2">方位角保留到小数点后的位数</param>
/// <param name="n3">大地线长度保留到小数点后的位数</param>
public void SetAccurate(int n1, int n2, int n3)
{
B1.Set_Accurate(n1);
L1.Set_Accurate(n1);
A12.Set_Accurate(n2);
B2.Set_Accurate(n1);
L2.Set_Accurate(n1);
A21.Set_Accurate(n2);
S = Methods.Set_Accurate(S, n3);
}