The test methods of effective opening size are studied after analyzing the hydraulic parameters of synthetic staple fibers needling nonwoven geotextiles.
通过对短纤针刺非织造土工布水力特性试验结果的分析，着重探讨有效孔径试验方法的问题。
2
For poor consumers, who spend up to 60 percent of their incomes on staple foods, this means a strong reduction in their effective purchasing power.