题目

如图所示，电路中A、B是规格相同的灯泡，L是自感系数较大且直流电阻可忽略不计的线圈，那么（ ） A . 闭合S，A，B同时亮，然后A变暗后熄灭 B . 闭合S，B先亮，A逐渐变亮，最后A，B亮度相同 C . 断开S，A和B均闪亮一下后熄灭 D . 断开S，B立即熄灭，A闪亮一下后熄灭 答案：A,D The rescue team ______to help but failed to get there in time. A. had wanted           B. have planned        C. were expecting      D. hoped