问题 问答题 简答题

高压阀如何检查修理?

答案

参考答案:

⑴核对阀门的材质,不得错用,阀门更换零件材质应先做金相光谱试验,更换材质应由金相试验人员同意,并做好记录

⑵清理检查阀体是否有砂眼、裂纹和腐蚀,若有缺陷,可采用挖补焊接方法处理

⑶阀门密封面要用红丹粉进行对口接触点试验达到80%,若小于80%,需要研磨,对于结合面上的凹面和深沟要采用堆焊方法

⑷门杆弯曲度、椭圆度应符合要求,门杆丝扣和丝母配合要无松动、过紧和卡涩现象

⑸检查瓦拉上下夹板有无裂纹、开焊、冲刷变形和损坏严重,瓦拉调节是否灵活,锁紧螺母丝扣是否配合良好,如有缺陷应更换处理

⑹用煤油清洗检查轴承,轴承应无裂纹,滚珠应灵活完好,转动无卡涩,蝶形补偿无裂纹或变形

⑺清扫门体、门盖、填料室、固定圈、压环、填料压盖、螺栓及各部件,达到干净、光泽

⑻测量各部分之间的间隙。

阅读理解

A famous teacher was speaking to the students at our school. He began his lesson by holding up a ¥100 bill. Then he said to the three hundred students, “Who would like this ¥100 bill?” The students began to put up their hands at once.

Then he said, “I am going to give this ¥100 to one of you, but first, let me do this.” He then made the bill into a ball. Then he said, “Who wants it now?” The hands went back into the air.

“Well,” he said, “What if I do this?” and he dropped it on the floor and stepped on it. He picked up the dirty, crumpled bill and said, “Who still wants it?” Hands went back into the air.

“My friends,” he said, “you have learned a valua-ble lesson today. No matter  what I did to the money, you still wanted it because it did not go down in value (价值)。 It was still worth ¥ l00!”

Many times in our lives, we are dropped, crum-pled, and stepped on by the chances we take and the things that happen to us. We feel as if we are worth nothing. But remember, no matter what has happened to you, you will never lose your value: you are always valuable to those people who love you. Your value doesn‘t come from what you do or whom you know, but WHO YOU ARE.

You are special and valuable. Don‘t ever forget it!

小题1:Even though it was dirty, the money _______.

A.still went up in value

B.was worth nothing

C.didn‘t go down in value

D.was still ours小题2:We are always valuable to the people _______.

A.who pay us

B.who call us

C.who hate us

D.who love us小题3:The sentence “Hands went back into the air” means “_______”。

A.the students put up their hands again

B.the students put down their hands

C.the students put their hands behind their backs again

D.the students put their hands in front of them小题4: Why did the famous teacher use a ¥100 bill at his lesson?

A.Because he wanted to make the bill into a ball.

B.Because he used to drop a bill on the floor and stepped on it.

C.Because he was going to give the bill to one of his students.

D.Because he wanted to make the students know what value was.

单项选择题