问题
单项选择题
交流发电机发电原理为：（）。
A.转动的磁力线、切割导线、感应出电流
B.转动的导线、切割磁力线、感应出电流
C.靠剩磁发电
D.由电枢发电
答案
参考答案：A
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交流发电机发电原理为：（）。
A.转动的磁力线、切割导线、感应出电流
B.转动的导线、切割磁力线、感应出电流
C.靠剩磁发电
D.由电枢发电
参考答案：A
Most adults once studied at school, had classes and did their homework every day. The same 36 is going on at school now. 37 it seems that doing weekend home-work is 38 problem for the modern students. All the students should agree that weekend homework should be canceled. It's 39 for them to study at school five days a week. They have a lot of interests. With homework to do on Saturday and Sunday, how can they find 40 to help around the house, go and see a football or basketball game or a good film, join in family recreations (娱乐), or just have 41 _ at home? Because of these other activities, the homework can't be finished until 42 . So their weekend homework is usually done in such a hurry that on Monday teachers are 43 and often threaten (威胁) to fail whole class of students because they know nothing about the 44 . If there were no weekend homework for the students to do, they would be happy to go to school on Monday _ 45 _ having a good rest and to learn what the teachers teach.
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