题干

如图所示,电源的电动势为E,内阻不计,A、B是两个不同的小灯泡,且RA<RB,L是一个自感系数很大、电阻不计的线圈.关于这个电路,以下说法正确的是(   )

A:开关闭合瞬间,A,B同时亮

B:开关闭合瞬间,B先亮,A后亮

C:开关断开瞬间,A灯闪亮一下再逐渐熄灭

D:开关断开瞬间,电流向左通过A灯

上一题 下一题 0.0难度 选择题 更新时间:2020-03-19 01:40:33

答案(点此获取答案解析)

D

同类题5

阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

        In my living room, there is aplaque that advises me to “bloom ____youare planted”. It reminds me of Dorothy. I got to know Dorothy in the early1980s, when I was teaching Early Childhood Development through a program. Thejob ____(responsible) requiredoccasional visits to the classroom of each teacher in the program. Dorothystands out in my memory as on one ____bloomed in her remote area.

       Dorothy taught in a remote school nearHarlan. To get to her school from the town of Harlan, I followed a road ____(wind) around the mountain. In theeight-mile journey, I crossed the same railroad track five times, giving thepossibility of ____(catch) by thesame train five times. Rather than feeling excited by this drive throughmountains, I found it depressing. The poverty level was shocking and the smallshabby houses gave me the greatest feeling of ____(hope).

        From the moment of my arrival at thelittle school, all my gloom disappeared. Upon arriving at Dorothy's classroom,I was greeted with smiling faces and treated like a queen. The children____(prepare) to show me their ____(late) projects. Dorothy told me witha smile that they were serving poke greens salad and cornbread they madethemselves for dinner.

        Lonely ____she was far away from the moderncivilization and convenience, she never ran out of reports of excitingactivities of her students. Her enthusiasm never cooleddown. She passed all the tests ____(excellent)and I found that Dorothy was really blooming where life had planted her.