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《九年义务教育三年制初级中学教科书》第二册物理的第三章第一节中,有这样一段话:“如果按我国每年消耗10亿吨煤,效率为30%来计算,那么,只要提高效率1%,即达到31%,就相当于节省一千万吨煤,也可以说相当于多了一个年产一千万吨煤的大煤矿.”这段话中最后的结论是错的.正确的结论应该是3000多万吨或约3225万吨,是书中结论的三倍多.应该说这不是小小的误差,而是错误.
In the first section of the third chapter of the ninth book of the nine-year compulsory education three-year elementary middle school textbook, there is such a statement: "If China’s annual consumption of 1 billion tons of coal, the efficiency is calculated as 30%, then As long as the increase in efficiency by 1%, ie, 31%, is equivalent to saving 10 million tons of coal, it can be said that it is equivalent to a large coal mine with an annual output of 10 million tons of coal. It is wrong. The correct conclusion should be more than 30 million tons or 32.25 million tons, which is more than three times the conclusion in the book. It should be said that this is not a small error, but an error.