The structure of probability screen vibration frame change unitary welded type to bolt fastening. This way USES handy and effect is well.
将概率分级筛激振器机架的结构由整体焊接式改为螺栓联接式，使用方便，效果很好。
Correspondingly it greatly reduces the probability of screen plugging, thus greatly improves the system's stability, reliability and security.
相应地大大降低了筛网的堵塞，从而也大大增强了系统的稳定性、可靠性和安全性。
Coordinates of a normal probability paper are calculated with a approximate formula of normal distribution integral curve and drawn on screen.
采用正态分布积分曲线的近似公式计算概率格纸的坐标，并在屏幕绘图。
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