The article summarizes the characters, resources and action principles of main air pollutants, and it also discusses the effects on people's health.
论述了几种主要大气污染物的性质、来源及其作用机理，并探讨了大气污染物对人体健康的影响及危害。
This article analyzes the action principles and structures of Frame Fault Protection and Rail Potential Limitation Device, and proposes a solution to coordinate them.
对框架故障保护和轨电位限制装置保护动作原理、结构进行了剖析，提出了二者之间的配合方案。
This article analyzes the action principles and structures of Frame Fault Protection and Rail Potential Limitation Device, and proposes a solution to coordinate them.
对框架故障保护和轨电位限制装置保护动作原理、结构进行了剖析，提出了二者之间的配合方案。
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