开放型问题对于激发同学们的求知欲,培养同学们的发散思维能力,能起到相当重要的作用.现举例说明如下.题目小明做了以下电学实验:如图1所示,将三个完全相同的小灯泡并联后,接在由干电池组成的电源两端.闭合开关S1,灯泡L1发光.再依次闭合开关S2、S3,灯泡L1逐渐变暗.小明对此现象 The open-ended questions can inspire students’ curiosity and cultivate their divergent thinking skills. They can play an important role. Now an example is given below. Title Xiaoming made the following electrical experiments: As shown in Figure 1, three complete After the same small bulb is connected in parallel, it is connected to the power supply consisting of dry cells. The switch S1 is closed and the bulb L1 is illuminated. Then the switches S2 and S3 are closed in turn, and the bulb L1 gradually darkens.