The problem and effect in actual application are analyzed, the using range and the problems to be noticed are also proposed.
并就在实际应用中出现的问题及应用效果进行了分析探讨，提出了应用范围和使用中应注意的问题。
The paper mainly gives the work condition of neutral current, introduces application of four-pole switch in different grounding systems and problems to be noticed.
文章主要阐述了中性线的工况和各种不同接地系统中四极开关的应用及应用中需要注意的问题。
The paper introduces meaning of coal mine occupation healthy safety control system and puts forward the problems to be noticed in the process of establishing the system.
介绍了职业健康安全管理体系的主要内涵，提出了建立体系应注意的问题。
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