The material selection and airflow measurement of the standard constant flow orifice were described.
同时还对标准恒流孔的材料选择及流量测量进行了论述。
Then, its measurement principle and theoretical formula, as well as the structural style and technical requirements of standard orifice were expounded.
阐述了孔板流量计的流量测量原理以及理论流量计算公式、标准孔板的结构形式和技术要求。
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