本论文对电力系统谐波的概念、特性及危害进行了详细的描述，进而说明了研究电力系统谐波模拟装置的重要意义。
This dissertation introduces harmonics' notion, characteristics and harm in detail, illuminates the significance of studying the electric power system harmonics simulator rig.
介绍了合成化学油漆的环境危害及其解决措施；描述了天然植物油漆的环保特性及其应用。
The environmental problems resulted from synthetic paints and solutions thereof are introduced. The features of environmental protection of crude vegetal paints and their applications are described.
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