题目

在如图所示的实验电路中，闭合开关，移动滑动变阻器的滑片后，发现电流表、电压表均有示数，小灯泡不亮．则故障原因是（ ）​ A . L断路 B . L短路 C . R断路 D . R短路 答案：BDon’t ________ women. They are as important as men for the development of society.A．look atB．look down upon C．look out forD．look forward to