如图是学生设计的模拟调光灯电路.闭合开关后移动回形针�现灯泡�光但亮度几乎不变产生这一现象的原因可能是 A.灯泡被短路 b Template




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tomski如图是学生设计的模拟调光灯电路.闭合开关后移动回形针�现灯泡�光但亮度几乎不变产生这一现象的原因可能是 a.灯泡被短路 b coloring