已知理想变压器的一次绕组匝数为160匝，二次绕组匝数为40匝，则

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问题单项选择题

已知理想变压器的一次绕组匝数为160匝，二次绕组匝数为40匝，则接在二次绕组上的1KΩ电阻等效到一次侧后，其阻值为（）KΩ。

A.4

B.16

C.8

D.1

答案

参考答案：B

翻译题

根据汉语提示完成下列句子。

1. On Friday afternoon, can you ________ (顺便拜访) the teacher's home to discuss the

________ (文化俱乐部)

2. There is something wrong with my teeth, so I have to ________ the________ (去看牙医).

3. ________ (整个下午) I did all kinds of things to stop the baby crying.

4. The boys often help the girls ________ (进行足球训练) with school teams.

5. Please keep ________ (安静), he is trying to study!

问答题简答题

简述利润最大化原则。