This article introduces the basic principle, instrument, analysis and calculative method on how to take count of bacteria by fluorescence microscope.

介绍了细菌荧光显微镜直接计数法的基本原理、仪器设备、分析和计算方法，并对水样过滤操作方法作了一些改进。

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This article elaborates the structural feature and operating principle of the high performance stop valve and to introduce the calculative formulas of working movement of the globe disk.

阐述了高性能截止阀的结构特点及工作原理，介绍了球形阀瓣工作行程的计算公式。

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