问题 问答题

对补胶设备的要求?

答案

参考答案:

1)金属表面应平整、圆滑、无沟槽、无毛刺、无气孔、凹凸处直径不大于3mm

2)焊缝应采用双面焊接,只有特殊情况下才允许采用单面焊接,焊缝不应有焊瘤、熔渣、焊缝表面应打磨成光滑的圆弧型,不允许有锐角存在

3)设备内凡具有棱角、支撑、挡板等附件时,应尽可能加工成圆弧形,其半径r>5mm,特殊部位允许>3mm

4)法兰应进行双面焊接,内焊缝后打成光滑的圆弧形,并不得高于法兰平面

5)衬里设备应有足够的刚性和强度,以免承受载荷后产生变形可使衬里结构破坏。大型设备要利用设备车身通入蒸汽进行硫化,所以在衬里前,必须进行水压试验,压力为工作压力的1.25倍,合格后方可进行下一步

6)直径较小无法进行双面焊接的设备(弯头等),可由技术熟练的焊工进行单面焊接,衬里时此处应采用“挂线排气法”防止硫化时起泡

7)敞口设备及管道需要在硫化罐内进行硫化,要求衬里设备适合硫化罐的尺寸要求。管道及设备在衬里前应进行试装合格,并打好标记

8)被衬里的金属表面必须容易用眼看到,并易用手和工具操作

9)需在衬胶后安装时进行焊接的部位,应在衬胶前预焊出支架,其长度不得小于100mm

10)直径小于200mm的弯头管件,应以无焊缝管件制成,小于200mm,的弯头,允许焊接制成,弯曲半径不小于管径的4倍

11)衬里设备的表面处理采用喷砂方法。采用石英砂,粒度通常2--3mm,要求不含有粘土或杂质,且干燥,含水量<1%,不得含有油污

阅读理解

阅读理解。

     Do this and you'll be welcome anywhere.

     Why read this book to find out how to win friends? Why not study the technique of the greatest winner

of friends the world has ever known? Who is he? You may meet him coming down the street. When you get

within ten feet of him, he will begin to wag its tail. If you stop and pat him, he'll jump out of his skin to show

you how much he likes you. And you know this show of love. There is no secret motives (动机): he doesn't

want to sell you any real estate(房产),and he doesn't want to be your husband or wife.

      Did you ever stop to think that a dog is the only animal that doesn't have to work for a living? A hen has

to lay eggs; a cow has to give milk; and a canary has to sing. But a dog makes a living by giving you nothing

but love.

     When I was five years old, my father bought a little yellow-haired young dog for fifty cents. He was the

light and joy of my childhood. Every afternoon around four thirty, he would sit in the front yard with his

beautiful eyes staring at the road, and as soon as he heard my voice or saw me through the bush, he was off

like a shot, racing breathlessly up the hill to greet me with leaps of joy and barks of cheer.

      Tippy was my good companion (同伴) for five years. Then one night-I shall never forget it -he was killed

within ten feet of my head, killed by lightning. Tippy's death was the terrible event of my childhood. You never

read a book on psychology (心理学), Tippy. You didn't need to.

     You know that one can make more friends in months by really interested in other people than one can in

two years by trying to get other people interested in him. Let me repeat that. You can make more friends in

two months by becoming interested in other people than you can in two years by trying to get other people

interested in you.

1. When the writer writes"the greatest winner of friends the world has ever known", he refers to _____.

A. himself

B. Tippy

C. a pet dog

D. a psychology book

2. The writer takes Tippy as a good example to ______. 

A. explain how to win love from others

B. show how he liked his friend

C. tell the readers why they should read the book

D. show us how a pet dog should behave

3. According to the writer, to be welcome anywhere, you must ______.

A. know much about others' feelings

B. do everything without secret motives

C. satisfy the needs of different people

D. show care and love for others

4. Generally speaking, in what manner is the passage written?

A. Light

B. Serious

C. Sad

D. Disappointed

选择题