问题 问答题 论述题

组装Y21l型封隔器的技术要求是什么?

答案

参考答案:

(1)组装前要按照图纸尺寸和要求检查各零部件尺寸和质量,对不合格的零件不能使用。(5%)

(2)根据套管规范,选择合格的卡瓦和扶正块。(5%)

(3)卡瓦要严格检验,新卡瓦最好抽样进行硬度检测和探伤检验,对硬度不够、有裂纹、卡瓦牙磨损严重或脱落牙者,要及时更换。(10%)

(4)卡瓦块要嵌在卡瓦座的燕尾槽内,并向外突出3~5mm,以防止蹩断卡瓦。(10%)

(5)组装后的扶正块要伸缩灵活自如,扶正块弹簧要求经过至少5次压缩而不折断。(10%)

(6)扶正器各螺纹连接部分要求必须上紧锁死,严防松扣。(10%)

(7)密封胶筒部件不能有老化起泡现象,密封圈过盈量在0.25~0.5mm之间,密封圈安装不能有扭曲现象,上好后要涂抹黄油以便安装。(10%)

(8)装胶筒前要求在中心管上涂抹黄油,且安装的胶筒外径不得大于钢体本体外径。(10%)

(9)卡瓦扶正部分组装后,要求换向灵活可靠、滑动自如。(10%)

(10)组装后,试压25MPa,稳压30min不渗不漏,无压降为合格。(10%)

(11)长时间不用,要求各部件涂抹黄油保管。搬运过程要求平稳,不能磕伤螺纹、胶筒等。(5%)

(12)建立组装试压记录,填写入库、使用清单。(5%)

单项选择题

New rules and behavior standards(行为规范) for middle school students came out in March. The Middle School is going to use a new way to decide who the top students are. The best students won’t only have high marks. They should not (染) their hair, smoke or drink because they are students. The following are some of the new rules.
Have you ever copied someone else’s work in an exam Don’t do that again! That’s not something an honest student should do.
Do more at school. Good students love animals and care for other people. April is Bird-loving Month in China. Is your school doing anything to celebrate it You should join! And you can learn more about animals and how to protect them. Be friendly to the people around you. Try to think of others, not only yourself.
Be open to new ideas. Do you think people can live on the moon7 Maybe you’ll find another earth someday. Don’t look down on new ideas. Everyone’s ideas are important. You should welcome them, because new ideas make life better for everyone.
Protect yourself. Has someone ever taken money from one of your classmates Don’t let it happen to you. If you have to go home late, you should let your parents know.
Use the Internet carefully. The Internet can be very useful for students. But some things on the Internet aren’t for children, so try to look at web pages (网页) that are good for you.

The passage mainly(主要地) tells us how to ______.

A.care for others

B.do more at school

C.be top students

D.use the Internet

单项选择题 A1/A2型题