题目

在探究串联电路的电压关系时，某同学使用的实验电路如图所示。他先用电压表正确的测量了灯泡L1 两端的电压。为了测量灯泡L2两端的电压，他想将电压表接A点的那一段导线改接到电路中的C点，而保持电压表接B点的不动．你认为这种接法是      的（选填“正确”或“不正确”），理由是                                         。 Not until ________ to school． [　　] A． was the war over that the children could go B． was the war over could the children could go C． the war was over that the children could go D． the war was over could the children go to school