A、<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: \'Times New Roman\'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">开关的闭合、断开<span lang="EN-US"><span style="mso-spacerun: yes"> </span></span></span>
B、<font face="宋体">电位的高、低</font>
C、<font face="宋体">真与假</font>
D、<font face="宋体">电流的有、无</font>
A、<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">开关的闭合、断开<span lang="EN-US"><span style="mso-spacerun: yes"> </span></span></span>