断开触点(在同一电路上) multiple-break contacts: 多断接触; 复式开路接点multiple contacts: 多次触球break make contacts: 断合接点break the four contacts with the track: 四个支点离开地面break-before-make contacts: 离合接触; 先断后合接点下载手机词典可随时随地查词查翻译