A、<span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">开关的闭合、断开</span></span></p><p><br/></p>
B、<span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">电位的高、低</span></span></p><p><br/></p>
C、<span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">真与假</span></span></p><p><br/></p>
D、<p style="text-indent:21px"><span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">电流的有、无</span></span></p><p><br/></p>
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