本文以长春市为例对城市办公空间结构的演变及其动力机制进行全面深入研究。
In this paper we choose Changchun City as an example and have a research on development and dynamic mechanism of the office space structure.
以长春市双阳污水处理厂为例，介绍了CAST工艺在冬季低温条件下活性污泥培养与调试运行的控制方法。
Taking Changchun Shuangyang Wastewater Treatment Plant as example, the controlling methods of activated sludge culture and debugging operation of CAST at low temperature in the winter were introduced.
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