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在高速水流研究中，含气量的测定具有实际的意义，作者试制了利用放射性同位素测定高速水流含气量的仪器，文中阐明了仪器的基本原理，仪器的设计和制造，校正和使用的方法，以及进行了仪器的误差分析。实验证明，在实验室中，在测定水流平均含气量时该仪器具有足够的精确度。
In the study of high-speed water flow, the measurement of gas content is of practical significance. The author tried to develop an instrument for measuring the gas content of high-speed water flow using radioisotopes. The basic principles of the instrument, the design and manufacture, calibration and use of the instrument are clarified. Instrument error analysis. Experiments show that in the laboratory, the instrument has sufficient accuracy in determining the average gas content in the water stream.