问题 问答题 简答题

请简述导热系数λ的含义。

答案

参考答案:

导热系数λ是在温度梯度为1K/m、导热面积为1m2的的情况下,单位时间内传递的热量。

选择题
阅读理解

阅读理解。

                                                                                                                                  108 Wensan Road

                                                                                                                                  London, 85 A 100

                                                                                                                                  England

                                                                                                                                  March 1st, 2008 

Dear Kate,

    I am writing to you in English. I hope you can understand it.

    I love studying in London and I have many new friends. Most of them are my classmates. From Monday to

Friday, we have Chinese, math, physics and P.E. in the morning. I like Chinese and physics, because they're

interesting. I don't like math. It's too boring. At noon, I have to have lunch at school because my home is far

from my school. We usually have two classes in the afternoon, art and politics. We finish our classes at 3:30

p.m. After school, my friends and I always play soccer on the playground. And then we go home by bus.

    On weekends, we have no classes. We often go to the park and sometimes we go to the movies in the

evening. We see movies twice a month. I like some famous stars like Jackie Chan.

    Oh, I have no time to write more. Please write back soon.

    Best wishes, 

                                                                                                                                            Wang Gang

1. Where is the writer studying? [ ]

A.In America.

B.In China.

C.In England.

D.In Canada.

2. How many classes does Wang Gang have every weekday? [ ]

A.Six.

B.Four.

C.Two.

D.No classes.

3. The writer doesn't like _____ at all, because it's too boring. [ ]

A.Chinese

B.art

C.movie

D.math

4. How does the writer go home every day? [ ]

A.On foot.

B.By bike.

C.By bus.

D.By car.

5. The writer and his friends go to the movies _____. [ ]

A.once a week

B.once a month

C.twice a week

D.twice a month