初二是物理教学的起始年级,有这样一道多年来遍及全国众多版本辅导书或习题集的单项选择题,并被演绎为多种内容或题型,或选编为中考题或竞赛题,归纳其实质内容概括为:给(一杯或是一盆)冰水混合物加热(在10℃室温下、或是在日光下、或是用酒精灯),(在冰块完全熔化以前)下列说法 The second grade is the beginning grade of physics teaching. There is such a single multiple-choice question that spans many editions of the counseling books or problem sets in the country for many years. It has been interpreted as a variety of content or question type, or selected as an intermediate examination question or competition question. Its essence is summarized as follows: heating (a cup or a pot) of ice-water mixture (at room temperature at 10°C, or under sunlight, or using an alcohol lamp), (before the ice is completely melted)