磁性方位角轴承是近似。
精确解与近似解的差异不仅表现在A4值的大小及符号（正负），而且表现在A4随方位的变化特征。
The exact and approximate solutions are different in the magnitude and signs (positive and negative) of A4 as well as the variations with azimuths.
通过对近场空间协方差矩阵进行修正，用重构在相同方位上的远场近似空间协方差矩阵确定声源方位角。
By using the reconstructed far-field approximation space covariance matrix at the same bearings from the revised near-field space covariance matrix, the bearings of multiple sources can be obtained.
由于航空遥感影像近似竖直摄影的特性，倾斜角非常小，几乎接近于零，而且内方位元素已知。
Because the aerial imagery is acquired by the way of vertical photography, the banking angle is very small, almost closing to zero, and the inner element is known.
数值计算结果表明，在高温近似下，所有原子的均方位移与温度成正比，纳米晶体颗粒内部原子的均方位移小于表面原子的均方位移。
The formula of mean square displacements of atoms in one dimensional monatomic nanoparticles is deduced by means of the theory of Greens function.
数值计算结果表明，在高温近似下，所有原子的均方位移与温度成正比，纳米晶体颗粒内部原子的均方位移小于表面原子的均方位移。
The formula of mean square displacements of atoms in one dimensional monatomic nanoparticles is deduced by means of the theory of Greens function.
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