Effect of electret membrane on activity of seeds and seedling drought resistance property of wheat and liquorice .

驻极体膜对小麦、甘草种子活力及幼苗抗旱性的影响。

The special noise cancelling electret or dynamic microphone guarantees clear communications in all conditions .

特殊的噪声消除电容或动圈麦克风保证了各种条件下的清晰通话。

Reviews the numerical simulation technology of gas-solid flow in the electret air filter , summarizes the research results , and points out the problems ought to be solved .

回顾了驻极体空气过滤器内气－固两相流动数值模拟技术的发展过程，概述了研究成果，指出了亟待解决的问题。