the ratio of obstruction

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%。

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。

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。

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）。