• 2021-04-14
    电路如图所示,换路前电路的状态已经稳定。t = 0时,开关S由a切换到b,换路后电阻上电流的初始值iR(0+)为(    )。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/20291effba3b479a8193c3974cfe82cf.png