平行方向的低频极限量高于垂直方向的低频极限量；
The low-frequency limit in the parallel orientation was higher than that in the perpendicular orientation;
相对于常规直接水冷铸造，低频电磁铸造提高铸态拉伸强度极限和延伸率。
And the ultimate tensile strength and elongation of low frequency electromagnetic cast billets are greatly increased.
对于低频扰动，当系统实现闭环控制后，像面上线扩散函数已接近衍射极限。
When the system close -loop controlling is realized for lower frequency perturbation, the approximate diffraction limited line spread function can again be achieved on the image plane.
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