The number of calibration curve: apparatus can store 9 calibration curve, 5 for one line, 4 for binomial parabola.
校正曲线数:仪器可存储9条标定曲线,5条为一元一次直线,4条为二项式抛物线。
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This paper begins with the binomial distribution in the random theory and then furthers on analysis of the distributive curve of Galton board experiment.