问题 多项选择题

关于阀门的安装要求,正确的说法有( )。

A.截止阀门安装时应按介质流向确定其安装方向

B.阀门与管道以螺纹方式连接时,阀门应处于关闭状态

C.阀门与管道以焊接连接时,阀门应处于关闭状态

D.闸阀与管道以法兰方式连接时,阀门应处于关闭状态

E.安全阀应水平安装以方便操作

答案

参考答案:A, B, D

解析:

阀门安装的要求是:

阀门安装前,应按设计文件核对其型号,并应按介质流向确定其安装方向;检查阀门填料,其压盖螺栓应留有调节裕量。当阀门与管道以法兰或螺纹方式连接时,阀门应在关闭状态下安装;以焊接方式连接时,阀门不得关闭,焊缝底层宜采用氩弧焊。安全阀应垂直安装;安全阀的最终调校宜在系统上进行,开启和回座压力应符合设计文件的规定。安全阀经最终调校合格后,应做铅封,并填写“安全阀最终调试记录”。因此,关于阀门的安装要求,正确的说法有:截止阀门安装时应按介质流向确定其安装方向,阀门与管道以螺纹方式连接时,阀门应处于关闭状态,闸阀与管道以法兰方式连接时,阀门应处于关闭状态。所以正确选项为ABD。

考点

工业管道工程施工技术

完形填空
My name is Ann. I am 16 years old. I never try to lose weight (减肥) but I am slim and beautiful.      ? Because I keep a       diet.
     breakfast, I always have some bread and an egg and I drink a glass of milk. It helps me start the day. I usually have breakfast at half past seven.
We have four lessons in the morning. At ten o’clock when I am not studying, I sometimes eat one or two pieces of sugar because I need lots of      .
Lunch usually begins at half past twelve. I often eat       beef, rice and vegetables for lunch. My mum says that lunch is very important so I       miss (错过) lunch at school. One hour after lunch, I eat some   42  . I usually eat one apple or two bananas. I like bananas best.
I drink three or four glasses of       in the afternoon because there is no calories in the water.
For dinner, I often have soup and vegetables. Tomatoes are my favourite. I usually have supper at half past seven. After dinner, I don’t eat or drink       I go to bed.
I never play basketball or volleyball. But I       a lot. I almost go everywhere on foot. That’s why I am so slim.
小题1:
A.WhyB.WhatC.WhereD.When
小题2:
A.deliciousB.smallC.bigD.healthy
小题3:
A.ForB.InC.OnD.To
小题4:
A.moneyB.waterC.foodD.energy
小题5:
A.anyB.someC.littleD.many
小题6:
A.usuallyB.oftenC.sometimesD.never
小题7:
A.breadB.meatC.vegetableD.fruit
小题8:
A.riceB.waterC.CokeD.milk
小题9:
A.whenB.afterC.beforeD.if
小题10:
A.playB.walkC.rideD.drive
单项选择题