提出问题读了贵刊2000年第3期《例谈自然科学综合习题》一文(以下简称《例文》)后深受启发,因对《例文》中的例1所述“新鲜鸡蛋放进稀盐酸中将会出现‘下沉(?)上浮’的返复运动现象及其解答”产生兴趣,但又不敢轻信,故笔者决 Asking questions after reading the article “How to Synthesize Natural Science Exercises” in the 3rd issue of 2000 (hereinafter referred to as the “Examples”) of the magazine was deeply enlightened, as described in Example 1 in the “Examples,” "fresh eggs are put in thin In hydrochloric acid, there will be a phenomenon of “retreat” and “solution” of the “sinking” and its solution. “Interesting, but not credible, so the author decided