对于一道竞赛题的答案何新梅老师做了好几个实验来验证,实验真实可信,这种精神和方法值得提倡,故发此文。问题似乎尚有深入讨论的余地,比如,有没有原题中所说进水流量小于出水流量的情况?如果有,又是什么情形?希望老师们进一步探讨。 For the answer to a competition question, He Xinmei has done several experiments to verify that the experiment is authentic and trustworthy. This spirit and method are worth advocating. Therefore, this article was published. It seems that there is still room for further discussion. For example, is there a situation where the inflow of water is smaller than the outflow of water in the original question? If yes, what is the situation? I hope the teachers can further discuss.