A simple method for calculating the standard formation heats of organic compounds containing nitrogen or sulfur by using of the group electronegativity is built up in this paper.
建立了用基团电负性计算含氮含硫有机物键裂能的简单方法，并且得到自由基标准生成热的计算方法。
Based on the principle of group electronegativity, through mathematical deduction, the author deduced the method for the comparison of the selectivity of floatation collectors.
以基团电负性原理为基础，通过数学推导导出了一种比较浮选捕收剂选择性的方法。
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