证明:d×F的方向与同方向 xf= orsOn90°=om= I=×R,R:对O点的位矢 证明:R=OO+F ×R=0×O0+0×r ×O0=0 D×R=0×F

Uint I. Basic listening Practice 1. Script M: Third World countries must improve their economies if they want to raise their W: But how can they do that when developed countries control world trade? Q: Which of the following is true?

Uint 8 I. Basic listening practice M: Scentists claim the world population has 99.5% of the same DNA w: But this doesnt tell us there is no such thing as race Q: What is true of the dna of difference races? 2. Script w: With the advent of the genetic map we know where everything is, but do we know

Ⅱ. Listening skills 1. M: Will you love and keep him in sickness and in health, as long as you both shall live? Q: Who is the woman 2. W: Mike, wake upl It is time to go to school. Hurry up or you're going to be late M: Dont worry. I can sleep all day Did you forget today is Martin Luther King's

Uint I. Basic listening practice 1. Script w: Did you hear? Helen got modeling jib! Shes going to be sashaying down the catwalk M: Wow, thats great! All that walking practice really paid off. And foe once she wont be complaining about being so tall

Uints I. Basic listening practice 1. Script W: Why do some people stay in one job for life while others switch jobs from time to M: Some people want a fixed routine so that they dont have to adapt tot new circumstances over and over again, while others think variety is the spice of life Q: According to the dialog, why do some people stick to one job for life?

Ⅱ. Listening skills W: From what i can remember the director asked us to rehearse this a hundred times M: One hundred times? Is the director out of his mind Q: What does the man imply? 2. M: Do you think we have made enough food for the party? w: The refrigerator is about to explode Q: What does the woman imply? 3. w: She said she might become a famous movie star M: Yes, and pigs might fly

1.如图所示载流导线在平面内分布,电 流为I,它在点O的磁感应强度为多少?

Ⅱ. Listening skills 1-12-a3-f4b5-c6-d7-h 9 III. Listening In Task 1: The Influence of Advertising Richard: Dad. I a pair of new shoes for an important basketball game. My old ones look

Uint IL. Basic Listening Practice 1. Script W: Did you see the paper today? There was an earthquake in brazil M: Yes, but it only measured 3. 5 on the Richter scale. I dont think there were any casualties