压缩机出口压力高,高于设定值,则离心式压缩机()。A.开放空阀 B.开防喘阀 C.升

题型:单项选择题

问题:

压缩机出口压力高,高于设定值,则离心式压缩机()。

A.开放空阀

B.开防喘阀

C.升转速

D.降转速

考点:合成氨装置操作工合成氨装置操作中级工合成氨装置操作中级工题库
题型:单项选择题

沸点随气压改变:许多物理现象跟气压的大小(通常说气压的高低)有关系,气压还对人类的生活,健康有重要影响.例如,在几千米高的山上,如果没有高压锅,连一顿熟饭都吃不上,就是由于水的沸点随气压改变的缘故.实验:烧瓶中的水沸腾(如图甲所示)后移去酒精灯,水停止沸腾;待水温降低一些后将大注射器接到烧瓶口上(如图乙所示),向外拉注射器活塞,看到了什么现象?这个实验说明了什么问题?实验表明:气压减小,水的沸点降低.换用其他液体,在各种气压下实验,表明一切液体的沸点,都是在气压减小时降低,气压增大时升高.

(1)研究问题的过程通常有下列的步骤:

A.提出假设;

B.分析归纳;

C.得出结论;

D.提出问题;

E.实验研究;

F.理论推导;

G.经验总结等.

你认为编者对“液体沸点与气压关系的研究”依次采取的步骤是_________(选择其中适当步骤前的字母表示).

(2)小明同学把图乙的装置改装成图丙的装置,注射器改为加热待水沸腾后才与胶管连接,并继续加热,目的是想通过实验验证“气压增大时,液体的沸点升高”,你猜想小明的操作是__________________和观察 _________

(3)小明的实验操作,你认为有什么危险值得注意?_________

题型:单项选择题

Kate said “Hello” to Mr Patel as she entered. She picked up a wire basket and walked towards the back of the store 1_____ the rice was kept. The room was quite large and divided by three long aisles(过道), with rows of shelves full of 2­_____. Besides her and Patel there were only two boys in the store. They were both wearing 3_____ overcoats. They looked rather 4_____ because the overcoats were too big for them. “5_____”, she heard one of them whisper to 6_____. She walked on to the next aisle and found the 7_____ she was looking for. Then she heard something else. It 8_____ like a box dropping on the floor. She looked through the small open space 9_____ goods on the shelf and saw one of the boys picking up a box. But 10_____ putting it in the basket, he dropped 11_____into the inside pocket of his overcoat. Kate looked back and 12_____ see Mr Patel at the door checking through a list. Then she looked through the 13______ in the shelf again. The boys still had their backs to her. They were putting something 14_____into their inside pockets and then one of them said, “Let’s get out of here.” They moved away from her.

When she got to the door the two boys were 15_____ her. She watched them 16_____ for the few lings in their 17_____. They had both 18_____ their overcoats. Mr Patel did not seem to know what they had done. He even 19_____ at them as they were about to 20_____. Now Kate decided to stop them.

小题1:1.

A.which

B.that

C.there

D.where小题2:2.

A.books

B.baskets

C.goods

D.magazines小题3:3.

A.dirty

B.long

C.grey

D.tight小题4:4.

A.strange

B.young

C.nervous

D.excited小题5:5.

A.Look up

B.Listen to me

C.Watch out

D.Put it down小题6:6.

A.him

B.her

C.the boy

D.the other小题7:7.

A.book

B.rice

C.bag

D.magazine小题8:8.

A.looked

B.heard

C.showed

D.sounded小题9:9.

A.between

B.of

C.around

D.at小题10:10.

A.instead of

B.before

C.without

D.as if小题11:11.

A.something

B.it

C.one

D.that小题12:12.

A.would

B.should

C.might

D.could小题13:13.

A.spot

B.space

C.goods

D.books小题14:14.

A.important

B.new

C.else

D.extra小题15:15.

A.looking at

B.talking to

C.in front of

D.behind小题16:16.

A.paying

B.looking

C.asking

D.reaching小题17:17.

A.hands

B.pockets

C.box

D.basket小题18:18.

A.thrown out

B.put on

C.buttoned

D.hidden小题19:19.

A.shouted

B.smiled

C.looked

D.laughed小题20:20.

A.leave

B.pay

C.speak

D.apologize

题型:单项选择题

火炬及排气筒是石油化工装置中的大型钢结构设备。制作火炬筒及排气筒的材料可以选用( )。

A.无缝钢管

B.不锈钢管

C.陶瓷管

D.钢板卷管

题型:单项选择题

加强腹肌沟管前壁的疝修补方法是

A.Bassini法

B.Halsted法

C.Ferguson法

D.McVay法

E.Shouldice法

题型:单项选择题

中国银行业不包括( )。

A.中央银行

B.投资银行

C.自律组织

D.银行业金融机构

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