图象是表示变量之间关系较常用的一种方法,它以其形象、直观的特点成为中考热点题型,但其中由于忽视细节造成的差错屡见不鲜,现举例如下.例1某兴趣小组做实验,将一个装满水的啤酒瓶倒置(如图1),并设法使瓶中的水从瓶口匀速流出,那么该倒置啤酒瓶的瓶底与瓶内水面之间的高度h随 The image is a method that indicates the relationship between variables. It is a hot topic in the examination because of its image and intuitive features. However, due to ignorance of details, mistakes are commonplace. The following examples are given below. Example 1 An interest group makes experiments A beer bottle filled with water is inverted (Figure 1) and managed to make the water in the bottle flow out of the mouth at a constant speed. The height h between the bottom of the inverted beer bottle and the water surface of the bottle is