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。
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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