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河北的姜印明先生来信指出了本刊2010年第8、9期中的一些印刷错误,并给出了一道题目的简单解法,姜先生的严谨认真的精神值得我们学习,也谢谢他对本刊的关心.
Mr. Jiang Yinming from Hebei pointed out some typographical errors in Issue 8 and 9 of 2010 and gave a simple solution to the problem. Mr. Jiang's rigorous and serious spirit deserves our study, and he also thanked him for his concern with this issue .