如图所示，电流从A点分两路通过对称的环形分路汇合于B点，在环形_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题不定项选择

如图所示，电流从A点分两路通过对称的环形分路汇合于B点，在环形分路的中心O处的磁感应强度

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A．垂直环形分路所在平面，且指向“纸内”

B．垂直环形分路所在平面，且指向“纸外”

C．在环形分路所在平面内指向B

D．磁感应强度为零

答案

答案：D

写作题

A. I have to study hard now.
B. No, you needn’t. I just went to bed late last night.
C. Yeah. I’ll never do that again.
D. I have a pain（疼痛） in my head.
E. You’d better learn from others.
F. Oh, no. I have to stay up again.
G. Thanks a lot.

A: Tom, you look tired today. Are you all right?
B:   小题1:  .
A: Sorry to hear that. I’ll phone the doctor.
B:   小题2: . I was getting ready for the coming exam.
A: You’d better go to bed earlier tonight.
B: 小题3: . Because I don’t have enough time to go over all the subjects.
A: Why? Must you study that way? It is bad for your health.
B: But I played too much last month. 小题4: .
A: I see, Tom. You’ve learned something from the past, haven’t you?
B:   小题5:  .
A: Good. I believe（相信） you.

填空题

如果一架飞机以30°倾斜角转弯，载荷因素是：（）.