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
| 根据对话情景和内容, 从对话后所给的选项中选出能填入每一空白处的最佳选项 | |
| A: It’s Sunday tomorrow. 1 B: Oh, I will watch a football match. It s between Shandong and Guangdong. A: Wonderful! I really hope Guangdong will win this time. 2 B: At 5:00 in the afternoon. I have two tickets here. I can let you have one. 3 A.Of course I would love to . but I can't, because we will have a basketball match tomorrow B: What a pity！ 4 A: A team from No.8 Middle School. B: 5 A: In my  school.B: Good luck to you and your team! A: Thank you. | |
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