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在一些找矿勘探方面的教材中,用来检验化学分析外检结果系统误差的或然率系数t的计算公式与二十年前的公式没有变化,即:
In some textbooks for prospecting exploration, the formula used to test the probability coefficient t of systematic errors in chemical analysis of inspection results has not changed from the formula twenty years ago, namely: