实验题能考查学生的观察和分析问题的能力 ,初中物理中有几个看似相同 ,实质不同的实验 ,不仔细观察 ,很易混淆 .现举例如下 ,以期大家在教学中注意 .图 1例 1　如图1所示 ,甲图为对沸腾的水停止加热 ,随即用注射器抽气 ,则看到的现象是　　　　 ,说明了　　　　　　　 .乙图为 The experiment questions can examine the students’ ability to observe and analyze problems. There are several seemingly identical, essentially different experiments in junior high school physics. They are not easily observed and are easily confused. The following examples are provided for the sake of attention in teaching. 1 As shown in Figure 1, A is to stop heating the boiling water, and then pumping with a syringe, then see the phenomenon is illustrated. B