Comprehensive and systematic analysis has been made about the dust pollution of the arid and semi arid areas in Gansu province based on statistic data of TSP and natural dust within last 10 years.

本文用近10年来TSP、降尘监测数据对甘肃省干旱、半干旱地区尘类污染进行了较系统、全面地分析。

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With several statistic graphs, the dissertation analyzes the systematic drawbacks of the property distribution system of our country's employee invention.

因此，本文的研究目的是提出完善我国职务发明创造激励机制与分配方案的一些对策。

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