the ratio of obstruction

Based on frauhofer diffraction integral formula, the calculation and testing method of I_0 ( annulation)/ I_0 ( aperture) for different obstruction ratio of double reflection optical system are described in this paper.

本文从夫朗禾费积分公式出发，论述了不同遮拦比的双反射光学系统I0（环）/I0（孔）的计算与测试方法，并通过计算和测量获得了有实用价值的数据。

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The coincident ratio of detecting the cause of obstruction was 86.7%, which was mildly superior to IUP and CT and showed statistically highly singnificant ( P < 0.01) comparing with ultrasound.

梗阻原因诊断符合率达86.7%，优于IUP与CT，但明显优于B超（P<0.01）。

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Owning to the obstruction of oriented glass fibers, thermal expansion ratio and die swell decrease in hoop direction.

由于玻纤的周向取向，挤出管材的出模膨胀及周向热膨胀率皆有所降低。

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Results: The ratio of drainage tube obstruction in the study group was 2.38%, that in the contrast group was 15.48%.

结果：堵塞率试验组为238%，对照组为1548%。

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