气源过滤精度应为() A.小于0.5um B.小于o.6um C.小于0.7um D

题型:单项选择题

问题:

气源过滤精度应为()

A.小于0.5um

B.小于o.6um

C.小于0.7um

D.小于0.8um

考点:仪表工考试高级仪表工高级仪表工题库
题型:单项选择题

(2013·山东高考)________ at the cafeteria before, Tina didn't want to eat there again.

A.Having eaten       

B.To eat

C.Eat

D.Eating

题型:单项选择题
I met Billy the last summer before college. He was handsome and his irreverence(玩世不恭) was    to me. We liked each other the first instant we met.       , I was a straight A student and my parents had high hopes for me to     an Ivy League (常春藤联盟) school. Billy did not concentrate all his attention        his study and school life. However, we were in love --- so        teenager love. I still remember we had a plan for prom(舞会). It was understood that we had       about where we would dance and drink and party together.
This meant one thing to my parents---panic. And it grew as the       letters began to roll in. Of the eleven schools I applied to, nine accepted me. And one of them was Brown University---the Ivy League     in 1770 in historic Providence, Rhode Island.
There was no         that I was drawn to Brown, but Billy (who had joined the army) was      down south and I had offers      for me there, too. I was torn between my love for him and my family      .
One week        the start of school, my mother had a talk with me. She said I was eighteen years old and I had a        to make--- one that went        beyond the choice of       to attend university.
In August, I      and drove north to Providence. It took several months to     that my life was moving on in a way that was completely different from Billy’s. Brown changed my life, opening doors and giving me the       I now use to think, to learn and to write. Life is always about       it seems, and the older I get, the more I understand this. Still, there are times when I think of Billy because he taught me about love.
小题1:
A.confusingB.disturbingC.appealingD.amusing
小题2:
A.UnfortunatelyB.ActuallyC.LuckilyD.Originally
小题3:
A.leaveB.start C.finishD.attend
小题4:
A.in B.atC.onD.from
小题5:
A.specialB.crazyC.wrongD.normal
小题6:
A.talkedB.lookedC.liedD.argued
小题7:
A.descriptionB.rejectionC.applicationD.acceptance
小题8:
A.constructedB.assessedC.assistedD.informed
小题9:
A.pointB.useC.doubtD.need
小题10:
A.leftB.sentC.exposedD.employed
小题11:
A.waitingB.askingC.hoping D.searching
小题12:
A.traditionB.connection C.reputationD.expectation
小题13:
A.beforeB.afterC.atD.since
小题14:
A.planB.decisionC.ruleD.promise
小题15:
A.outB.awayC.farD.deep
小题16:
A.whenB.whereC.whetherD.how
小题17:
A.got upB.packed upC.looked upD.turned up
小题18:
A.foreseeB.imagineC.realizeD.consider
小题19:
A.chancesB.positionC.equipment D.tools
小题20:
A.surprisesB.adventuresC.opportunities D.choices
题型:单项选择题

何谓库尔特原理?

题型:单项选择题

在列车管无风的情况下,总风管压力空气可以提供制动用风

题型:单项选择题

2008年诺贝尔化学奖授予了三位在研究绿色荧光蛋白(GFP)方面做出突出贡献的科学家。绿色荧光蛋白能在蓝光或紫外光的激发下发出绿色荧光,这样借助GFP发出的荧光就可以跟踪蛋白质在细胞内部的移动情况,帮助推断蛋白质的功能。已知GFP基因最初从发光水母中提取出来。GFP基因可作为目的基因用于培育绿色荧光小鼠,下图表示培育绿色荧光小鼠的基本流程,请分析回答:

GFP基因有时还可与其他目的基因一起构建到载体上,不影响目的基因的表达,且对细胞无毒害作用,因此GFP基因可以作为基因表达载体上的()

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