The history and present situation of organic polymer flocculant applied in water treatment are introduced.
介绍了我国有机高分子絮凝剂研究开发的历史与现状及其在水处理中的应用。
Firstly, the thesis introduced the history and present situation of Chinese professional soccer transfer system.
本文首先介绍了我国职业足球转会制度的历史沿革和现行转会制度的主要内容。
The history and present situation of domestic crisis mines were outlined.
概述我国危机矿山历史、现状；
Third part: the history and present situation of Huai-Bang Opera folk troupe.
第三部分：怀梆戏曲班社的历史与现状。
Third part: the history and present situation of Huai-Bang Opera folk troupe.
第三部分：怀梆戏曲班社的历史与现状。
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