To ensure normal operation of the substation, the DC system grounding fault should be detected as quickly as possible.

为保证直流系统的正常运行，查找直流接地故障的时间应尽可能缩短。

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The research of keeping the steady operation of motors under various states of start, normal operation, over load for positionless sensor brushless DC motor is analyzed here.

文章就无位置传感器无刷直流电机的起动、正常工作、过载等状态下如何保持电机稳定运行进行了分析。

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Part I Culture ex vivo and identify of dendritic cell (DC) Objective to investigate dendritic cells of peripheral blood of patient with hepatocellular carcinoma compared with that of normal donor.

第一部分树突状细胞(DC)的体外培养与鉴定目的：探讨肝癌病人外周血树突状细胞与正常人外周血树突状细胞之间的差异。

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