The related research status at home and abroad was introduced from four types of common mathematical methods in this paper.
本文从四类常用的数学方法入手，介绍了国内外的相关研究现状。
The principle of microbial removal of organic and inorganic sulfur from coal and the present research status at home and abroad are introduced.
介绍了微生物脱除煤中有机硫和无机硫的原理以及国内外研究现状。
This paper introduces the background of wireless sensor networks, the research status at home and abroad, and the ideas and contents of papers at first.
本文首先介绍了无线传感器网络的研究背景以及国内外研究现状，并对论文的思路和内容安排做了简要的介绍。
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