Then these equations are solved numerically by approximating the unknown displacement difference to a product of the fundamental density function and polynomials.
其次，在数值求解该组方程的过程中，未知函数裂纹表面位移差被近似为位移差的基本密度函数与多项式之积。
2
Standard liquid is used to determine the liquid absorbing coefficient so that the unknown liquid density is measured.
利用标准溶液确定溶液的吸收系数，进而可以测量出未知溶液的浓度。
3
When the probability density function of the random series is unknown, the order of the model and the unknown parameters are estimated to make possible the solution for an actual case.