如图所示是一种门铃按钮开关构造的截面图下面说法正确的是 A.ab是导体cd是绝缘体b.cd是导体ab是绝缘体c.ad是 Template




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tomski如图所示是一种门铃按钮开关构造的截面图下面说法正确的是 a.ab是导体cd是绝缘体b.cd是导体ab是绝缘体c.ad是 coloring