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一、选择题1.(2005年大连市物理竞赛试题)图1所示为一种按钮开关的构造截面图.图中C是按钮,D是外壳,A、B各有接线柱与电路相连接.下列说法正确的是().
First, the multiple-choice questions (2005 Dalian physical competition questions) Figure 1 shows the structure of a button switch cross-section diagram. C is a button in the figure, D is the shell, A, B are connected to the terminal with the circuit The following is correct ().