问题 问答题

某电气安装工程项目,业主与某电力工程公司签订了工程项目总承包合同。该工程项目的变压器采用自耦式变压器(容量为800kV·A),电机采用三相异步电动机。

该工程项目的设计单位对变压器的采购编制了采购计划,经业主批准后,由项目经理进行采购。工程监理单位负责对变压器检验的组织工作。变压器运抵施工现场后,进行了开箱验收,经验收合格后,按吊装、吊芯检查、就位、试验、干燥的程序和要求进行安装。变压器安装完毕后,进行了绝缘油的击穿电压试验和交流耐压试验。绝缘油在试验时,温度一直保持在40℃左右,且在清洗注油后即开始加电压试验。变压器安装完成后静止5h开始进行交流耐压试验。

三相异步电动机在检查过程中经电气试验发现质量可凝。

在三相异步电动机经电气试验发现质量可疑时,应该如何进行进一步检查?

答案

参考答案:

在三相异步电动机经电气试验发现质量可疑时,应做抽芯检查。

阅读理解

阅读理解。

     At the middle school level, there are many academic clubs in which students can participate. Students

can choose clubs that focus on an area of interest.

     Mathcounts Club

     Mathcounts tries to increase excitement towards mathematic achievement. It hopes to provide students

with the foundation for success in science, technology, engineering and mathematics careers. Schools select

individuals and teams to participate in competitions. Local competitions are held in February with winners

progressing to state competitions and then on to the national level. Mathcounts works to challenge student's

math skills, develop selfconfidence and give rewards for their achievements.

     Envirothon

     The Envirothon program focuses on natural resources knowledge and exposes students to diverse

environmental issues, ecosystems (生态学). The ecology field competition for five-member middle school

teams offers competitions in wildlife, soil, forestry, and current environmental issues. Students work and

learn in middle school clubs and can compete at the local and state level.

     Future Problem Solvers

     Future Problem Solvers is an academic club that uses a six-step process to solve problems that may

happen in the future. Students who are in the talented and gifted program, who like to"think out of the box",

or who enjoy thinking about futuristic problems may like this club. Teams made up of four students read

future scenes and write up solutions in a booklet using the six-step process. Teams that score high enough

can go to the state competition and then to the international competition.

     Builders Club

     Builders Club is open to any middle school student who wishes to perform community service. Each

Builders Club is co-sponsored (共同捐助) by a Kiwanis club and the middle school. The members learn

by doing, and they learn organization, teamwork, and leadership. Builders Clubs can sponsor a "Teacher

of the Year" program, provide a recycling collection point, organize canned food and clothing drives to

support local shelters.

     Middle school academic clubs offer students a place to explore interests or talents. The clubs they join

in middle school can help guide choices in high school and beyond.

1. Students choosing Mathcounts Club could ____.

A. get help in science careers

B. enjoy solving future problems

C. perform community service

D. study wildlife and soil

2. If you enjoy thinking about futuristic problems, ____ is a good choice for you.

A. Mathcounts Club

B. Builders Club

C. Future Problem Solvers

D. Envirothon

3. The students who are not interested in competitions would like to choose ____.

A. Mathcounts Club

B. Builders Club

C. Future Problem Solvers

D. Envirothon.

4. What is the common feature of the four clubs?

A. Competitions.

B. Leadership.

C. Scientific researches.

D. Exploration of talents.

单项选择题