问题 问答题 简答题

为什么DL/T572-95《变压器运行规程》规定油浸式变压器上层油温不许超过95℃?

答案

参考答案:

一般油浸式变压器的绝缘多采用A级绝缘材料,其耐油温度为105℃。在国标中规定变压器使用条件最高气温为40℃,因此绕组的温升限值为105-40=65(℃)。非强油循环冷却,顶层油温与绕组温约差10℃,故顶层油温升为65-10=55(℃),顶层油温度为55+40=95(℃)。强油循环顶层油温升一般不超过40℃。

单项选择题 A1/A2型题
阅读理解

Today, traditional opinions about men still exist. A man has to be strong, brave, sports loving and manly. Anything less would not be considered manly. Sports such as football, basketball and boxing all tend (往往是) to be men’s sports. However, the dance of ballet is considered feminine because it requires nice movements. This tradition is shown in the movie, Billy Elliot.

Billy Elliot is a movie that protests against this traditional view of men. Billy Elliot is an eleven-year-old boy that has a natural talent for ballet dancing, but his father will not allow it. Billy’s father wants him to take up boxing and become stronger, but Billy goes against his father’s wishes and takes up ballet dancing. This difference of opinion makes Billy sad. What’s more, his friends also laugh at him.

After saving enough money, his father sends Billy to a weekly boxing course; however, Billy doesn’t enjoy boxing because he always loses in matches and is often hurt. His ballet teacher, Mrs. Wilkinson thinks that men or women should not be judged by the activities they like to do, so she tells Billy’s father that although he wants his son to make a good living, he should let his son do what he loves to do because he has a talent for it. When his father finally realizes the truth, Billy is surprised. In the end, with the help of his father, brother and all the people around him, Billy goes to the Royal Ballet Academy in London and becomes a very successful ballet dancer.

小题1:The underlined word “feminine” in the first paragraph most probably means ______

A.of men

B.of children

C.of women

D.of students小题2:Why is Billy laughed at by other children?

A.He always loses in boxing matches.

B.He isn’t strong.

C.He looks like a girl.

D.He loves ballet.小题3:What do we know about Billy?

A.His teacher encourages him to take up ballet dancing.

B.He does well in ballet dancing and boxing.

C.He does what his father wants him to do.

D.He has never taken up any men’s sports.小题4:From Billy’s story, we can see that _______.

A.children should accept their parents’ opinions

B.we should try to fight against traditional opinions

C.men and women play different sports

D.parents should let their children do what they are interested in