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【类型例题】例1(1993年全国)如图1所示,A、B是一对中间开有小孔的平行金属板,两个小孔的连线与金
[Example of type] Example 1 (National in 1993) As shown in Fig. 1, A and B are parallel metal plates with small holes in the middle, and the connection between two small holes and gold