问题
多选题
如图所示，理想变压器原副线圈匝数之比为4：1，原线圈接入一电压为u=220 sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（ ）A．副线圈中电压表的读数为55V B．副线圈中输出交流电的周期为0.01s C．原线圈中电流表的读数为0.5A D．原线圈中的输入功率为110  |
W
答案
AC
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| 如图所示，理想变压器原副线圈匝数之比为4：1，原线圈接入一电压为u=220sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（ ） A．副线圈中电压表的读数为55V B．副线圈中输出交流电的周期为0.01s C．原线圈中电流表的读数为0.5A D．原线圈中的输入功率为110 |
AC
| 根据对话内容，从对话后的方框中选出能填入空白处的最佳选项，使对话意思完整、通顺。 选项中有一项是多余的。 | |
| Jane: Hi, Alan. 1_______ How are you? Alan; Hi, Jane. I'm fine, thank you. And you? Jane: I'm fine, too. 2_______ Alan: I have been to Shanghai. I stayed there for about one month. Jane: You had a great time there, I am sure. Alan, I've come to return the book I borrowed from you two months ago. 3_______ Alan: It doesn't matter. 4_______ Jane: Yeah, I like it a lot. I've read it again and again. The writer is one of my favorites. Alan: Really? I still have some of his books. 5_______ Jane: Thank you so much. I can't wait to read them. | |
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