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
| 阅读理解。 | ||||||||||||||||||||||||
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| 1. Mary is going to the cinema at seven on _________. | ||||||||||||||||||||||||
| A. Monday evening B. Wednesday evening C. Friday evening D. Sunday evening | ||||||||||||||||||||||||
| 2. On Wednesday afternoon Mike is going to _________ | ||||||||||||||||||||||||
| A. enjoy the concert B. see some friends C. see a doctor D. have an art class | ||||||||||||||||||||||||
| 3. Mary is going to _________ on Wednesday evening. | ||||||||||||||||||||||||
| A. have supper with Ann B. have a basketball party C. study for an exam D. watch a basketball match | ||||||||||||||||||||||||
| 4. Mike's basketball team party starts at ________on Sunday | ||||||||||||||||||||||||
| A. 7:30 p.m. B. 8:00 p.m. C. 8:30 p.m. D. 9:00 p.m. | ||||||||||||||||||||||||
| 5. From Mike's and Mary's plans we know that they both like ________. | ||||||||||||||||||||||||
| A. shopping B. concerts C. art D. music |
