问题
多选题
如图所示,理想变压器的原副线圈匝数比n1:n2=1:10,副线圈与阻值R=20Ω的电阻相连.原线圈两端所加的电压u=20![]() A.副线圈输出交流电的频率为10Hz B.交流电压表的示数为20 C.电阻R上消耗的电功率为2kW D.原线圈中电流的最大值为100A ![]() |
答案
AC
如图所示,理想变压器的原副线圈匝数比n1:n2=1:10,副线圈与阻值R=20Ω的电阻相连.原线圈两端所加的电压u=20![]() A.副线圈输出交流电的频率为10Hz B.交流电压表的示数为20 C.电阻R上消耗的电功率为2kW D.原线圈中电流的最大值为100A ![]() |
AC
从方框中选择正确的句子补全对话。其中有两项是多余的。 | |
A: 1______. B: Could you tell me where the scarf is? A: Sure, 2______. B: Thank you. Wow, there are a lot of beautiful scarves here. C: Yes, they are all very beautiful. This blue one fits on you very well. B: 3______. C: Yes, please. B: Mm, it looks very nice. 4______. C: It's twenty yuan. B: 5______. Here is the money. C: Thank you. Welcome back again.
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