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 sin20πt(V)，则（ ）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  |
V
答案
AC
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| 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=20sin20πt(V)，则（ ） 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
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We just want to say thank you for having us before we caught the plane last week. It was a nice evening, and we enjoyed _小题1:_ Peter and Sarah. With your help we were able to get to the airport with plenty of time. We often tried to get an earlier flight (航班) than usual, but it wasn't possible. We had a _小题2:_ holiday in Spain (西班牙). We just loved driving through the countryside, and we often _小题3:_ to walk round a mountain village. We met _小题4:__ friends, Bill and Sue, and they invited us to have a meal with them. They wanted us to stay with them. But we couldn't, as we had already booked (预定) two rooms in a hotel. The weather was nice. There _小题5:_ so much beautiful sunshine all time we were there. Leaving Spain was very sad. It made me want to cry. Anyway, we are looking forward to hearing from you, and hope to see you soon. Let me know if you're ever in the area. You must call in. Yours, Ray |