问题 问答题

在2008年的雪凝灾害中,我省很多电力设施因结上重重的冰凌而被损坏,如图所示。今年初我省部分地区再次遭受雪凝灾害,但电力部门采用了“直流融冰”的新技术,即在原输电导线中输入3000A左右的直流大电流对输电线路进行融冰,从而避免了输电线路因结冰而杆倒线断。请你分析这种新技术采用大电流融冰的基本物理原理。

答案

“直流融冰”技术主要是电流很大,根据电流的热效应和P=I2R原理,电流在导线上会产生大量的热,而使冰凌被熔化。

阅读理解

第三部分:阅读理解(共15小题,每小题2分,满分30分).

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

 A

Scholars and researchers have tried to discover what personality characteristics go along with success in intercultural experiences. Their findings have often been unclear or incomplete. But three characteristics stand out in their reports: patience, a sense of humor, and the awareness of being unclear. 

Patience, of course, is the ability to keep calm even when things do not go as one wants them to, or hopes they will, or has even been sure they will. Impatience sometimes brings improvements in relations with other people, but usually it does not. 

A person with a sense of humor is less likely to take things too seriously and more ready to see the humor in his own reactions than a humorless person. The value of a sense of humor really needs to be paid more attention to. “The awareness of being unclear” is a more difficult concept than patience or a sense of humor. Foreigners often find themselves in situations that are unclear to the newcomers. That is, they do not know what is happening in the situation. Perhaps they do not understand the local language well enough, or they do not know how some system or organization works, or they can’t be sure of different people’s roles in what is going on. “It’s like I just got here from the moon,” a Chinese graduate student who newly arrived in the United States said, “things are just so different here. ”

56. The passage mainly tells us_____. 

A. some problems about communication.                

B. humor- an important thing in communication. 

C. some characteristics in communicating with foreigners. 

D. three useful ways of communicating with foreigners. 

57. From the third paragraph, we can infer that a humorous person_____. 

A. tends to treat everything carelessly              B. is optimistic about things.

C. likes making fun of others.                    D. is an impatient one .

58. The underlined part “The awareness of being unclear” refers to “_______”. 

A. knowing the meaning of an exact situation.    B. not stating clearly what happens. 

C. realizing the possible misunderstanding           D. being aware of the unclear situations. 

59. What can we know from the passage?

A. It is necessary to learn a language before you go abroad. 

B Americans are used to the culture of other countries. 

C. Patience usually improves the relationship with others. 

D. To live in a foreign land, one should get fully prepared. 

单项选择题