变频技术的研究现状与发展趋势 - 电源门户网 - 设计技术 关键词： 变频技术；PWM；研究现状；发展趋势 [gap=394]Key words: Frequency conversion technique; PWM; Study status quo; Development trend
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This paper introduced definition, measurement, application and study status quo of water activity.
本文介绍了水分活性的定义并对其检测方法、作用及研究现状进行综述。
In this article, the characters and study status quo of the STRs in cattle and their application in forensic science were briefly introduced.
本文就牛微卫星标记的特点、研究现状及其在法庭科学中的应用加以论述，并对前景加以评定。
This article reviews the study status quo of the time window, pretreatment assessment, and selection of patients and drugs for intra-arterial thrombolysis.
文章对动脉内溶栓治疗的时间窗、治疗前评价、病例和药物选择等研究现状做了综述。
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