题目

对话排序A: No, they're Mike's.B: It's Gina's. And the blue schoolbag is hers, too.C: What about this dictionary?D: Hi, Anna. Are these your books?E: Thank you for your help, Anna.F: And the eraser? Is that yours?G: You're welcome.H: Yes, it is.​ 答案：【1】D【2】A【3】C【4】B【5】F【6】H【7】E【8】G下列电路图中电源电压U保持不变，小灯泡的额定电压为U，且U＞U，定值电阻的阻值为R．在不改变电路连接的情况下，能测出小灯泡额定功率的是（ ）A．B．C．D．