HB97 bigger crystal nature gamma logging tool is designed for overcoming logging curve repeating errors due to statisticalvariation.
为了克服自然伽马测井时，由于统计起伏所造成的测量曲线重复性误差而设计制造HB97型测井仪。
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Using SPC statistical control, optimization of inventory turnover period of production and service processes the operation, is designed to reduce process variation and waste.
采用SPC等统计技术控制，优化库存周转期的生产和服务过程那个的操作，目的是减少过程变差和浪费。
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Results We analysed the variation of data, like et, NO, and used relative statistical method.