low air permeable coal seams 低透气性煤层
The use of air as a circulating medium for drilling is the best way for the development of low pressure and low permeable formation.
空气钻井采用空气作为循环介质，最适低压和低渗透储层的开采。
A filter media for an active field polarized media air cleaner comprises two layers of dielectric material, and a high-impedance permeable net is sandwiched in the low-impedance dielectric layer.
一种用于有效场极化介质空气净化器的过滤介质，包括两层介电材料，并且在低阻抗的该介电层之间夹设有高阻抗的透气网。
The present invention may be used to produce flexible, waterproof, air permeable synthetic leather product with simple post processing, high fur feeling and low cost.
生产出的合成革产品柔软、防水、透气性 好，且后期加工磨毛容易，皮感较强，又降低生产成本。
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