Filter bed should be exposurd as less as possible because alternation of exposure and immersion is disbennifit to the penetrability of filter bed.

依据水质资料分析了水源水质安全保障。

Its existence is due to its peculiar traits, among which the most important ones are particular autorhythmicity, self coerciveness, universal penetrability and lofty ideality.

道德主要特质有:独特自律、自我强制、普遍渗透高理想。

Argillaceous rheological property and penetrability of clay have been decided by zeta-potential,which is conducted by the mobile surface of clay particle and electroneutrality media of solution.

运动中黏土颗粒表面与溶液电中介质形成电动电位决定了黏土流变学质渗透质。