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例1 如图1所示的装置中,有两个薄铁片ab、cd,它们各有一端固定在一块木板上,另一端相互交叠但相隔一个很小的距离,薄铁片连接在
Example 1 In the device shown in Fig. 1, there are two thin iron pieces ab, cd, each having one end fixed on one piece of wood and the other end overlapping each other but separated by a small distance. The thin pieces of iron are connected to each other.