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。
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。
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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