问题 问答题 简答题

电动机轴承润滑脂填加量的标准是什么

答案

参考答案:

一般内油盖充入量控制在1/6-1/3油室空间,外油盖充油量控制在1/3-2/3油室空间。轴承本身充入量控制在轴承总空间的1/2-2/3,对高速电机润滑脂应少一些,超过或低于这个标准都不利于轴承的运行。

阅读理解

Looking for a children’s book? Internet users can find hundreds of them. These books are from around the world. And they are free to readers. The United States has started a project called the International Children’s Digital Library. It is supported by the National Science Foundation, the Library of Congress and the institute of Museum and Library Services.

The goal of the project is to offer more than 10,000 children’s electronic books in at least 100 languages. Some of the books show the similarities and differences in ways of life around the world. They will enable children to have a better understanding of other people’s cultures. People working for this project have tried to design easy ways to search the collection and read the books. A picture of each page appears on the computer. Users can also print the pages on paper if they want to.

The project is for two main groups of users. The first group is children between the ages of three and thirteen, along with their teachers and parents. The second group is researchers of children’s literature(文学). The books can help children understand more about the world.

小题1:The books in the project can make children better understand ________.

A.other people’s cultures

B.their own culture

C.their teachers and parents

D.researchers of children’s literature小题2:In this project, the electronic books are ________.

A. expensive to readers                 B. from the U.S.A.

C. in different languages               D. for children only

小题3:The underlined word “goal” probably means ________ in the passage.

A.山羊

B.煤炭

C.进球得分

D.目标小题4:The third paragraph is mainly about ________.

A.the purpose of the project

B.the users of the project

C.people working for the project

D.museums and libraries

填空题