Taking soils as three-phase medium, a study on wave propagation in nearly saturated soils is presented in this dissertation.
本文将土体视作三相介质，对准饱和土中波的传播特性做了深入的研究。
Due to the prodigious proportion of medium and big electronic equipment in power line, the research of three phase reversible converter is becoming the researching hotpot on international and native.
由于中大功率的电力电子设备在电网中占很大的比重，因此高功率因数的三相可逆变流器的研究已成为当今国内外研究的一大热点。
Based on practice, the reasons of large and medium-sized high voltage wound rotor three-phase asynchronous motor rotor failure were expounded, and viable approach was designed.
结合生产实践，系统阐述了大中型高压绕线转子三相异步电动机转子产生故障的原因，并提出了可行的处理方法。
Based on practice, the reasons of large and medium-sized high voltage wound rotor three-phase asynchronous motor rotor failure were expounded, and viable approach was designed.
结合生产实践，系统阐述了大中型高压绕线转子三相异步电动机转子产生故障的原因，并提出了可行的处理方法。
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