在如图中所示的电路中,要使灯L1、L2组成串联电路,应闭合开关______;要使 发布时间:2017-04-27 03:19 │ 来源:www.tikuol.com 题型:填空题 问题: 在如图中所示的电路中,要使灯L1、L2组成串联电路,应闭合开关______;要使组成并联电路,应闭合开关______;同时闭合开关______是不允许的,因为此时电路将发生______故障.
题型:填空题 We were told that we should follow the main road _____ we reached the central railway station . [ ]A. whenever B. until C. while D. wherever 查看答案