热门试题:
[单项选择]焦耳-汤姆逊效应引起的气流温降，在气体管道上通常为（）℃.
A. 1~3
B. 3~5
C. 5~7
D. 7~9
[单项选择]不能被噬菌体感染的微生物是（）
A. 真菌
B. 螺旋体
C. 支原体
D. 细菌
E. 病毒
[单项选择]女性病人，57岁。因胆囊结石伴慢性胆囊炎、行经腹腔镜胆囊切除术。术中以1.5%的异氟烷维持麻醉，辅助小剂量芬太尼。手术进行到1小时后病人的血压升高、心率增快，将异氟烷的浓度升至2%，效果不良。确诊二氧化碳蓄积的最简便有效的方法是（）。
A. 病人的临床表现
B. 观察钠石灰的颜色
C. 测定呼气末二氧化碳分压
D. 行动脉血气分析
E. 测定分钟通气量
[单选题]JAC 的团队学习就是要求建立( )的闭环系统。
A.反思反馈共享
B.反馈反思共享
C.学习实践
D.实践学习
[判断题]安全带和专作固定安全带的绳索在使用前应进行外观检查。( )
A.正确
B.错误
[单选题]峭壁、陡坡的工作场地或人行道上，冰雪、碎石、泥土应经常清理，靠外面一侧应设（）高的栏杆。
A.1050～1100mm
B.1150～1250mm
C.1050～1200mm
D.1150～1200mm
E./
F./
[单选题]提速道岔上长度(不含钉帽的全长)为167mm的销钉( )。
A.用于钢枕滑床板
B.用于转辙器滑床板
C.用于护轨垫板
D.可以通用
[判断题]企业要发挥好安全培训教育的作用。
A.正确
B.错误
[判断题]在人类道德的历史发展过程中，在一定的时期内可能有某种停滞和倒退。（ ）
A.正确
B.错误
[单项选择]鼓风机（）电阻是调节出风量的一个辅助元件
A. 调速
B. 升速
C. 调压
D. 调流
[单选题] 非生产技改类限上项目指单项费用总额在（ ）万元及以上的项目。
A.500
B.400
C.300
D.200
[多项选择]痤疮的治则是（）。
A. 祛风
B. 宣肺
C. 滋阴
D. 清热
E. 化湿
[单项选择]“＜title style=”italic”＞science＜/title＞”是XML中一个元素的定义，其中元素的内容是（）。
A. title
B. style
C. italic
D. science
[单项选择]患者男性，年龄26岁，因骨折，拟行外科手术，备血800毫升。现将患者血液标本按国家要求送检，准备进行传染病四项检测。该实验室用100份血清以参比试验进行检测，5份血清为真阳性，95份血清为真阴性。用该试剂试验，检测出4份为阳性，96份为阴性，则该试剂的阳性预示值为（）
A. 95%
B. 70%
C. 96%
D. 80%
E. 100%
[单选题]未按规定处置预报信息造成迟办、错办或漏办，定（ ）责任。
A.列车调度员
B.机车司机
C.动车组机械师
D.列车长
[单选题]班务会，由班长主持，星期日晚饭后进行，一般不超过( )。
A.1小时
B.1.5小时
C.0.5小时
D.2小时
[单选题]5.73.第73题35kV预制式电力电缆终端头制作安装终端套管时，将终端套管底部裙边向内翻转，用干净的手指或用塑料棒将硅脂均匀涂在电缆的绝缘层上和终端套管内。
A.正确
B.错误
[判断题]这种按一定比例混合的燃油、空气混合物，称可燃混合气。
[判断题]断路器固有分闸时间称断路时间。( )
A.正确
B.错误
[不定项选择题]共用题干
第一篇
Graphene' s Superstrength
Big technology comes in tiny packages.New ccii phones and personal computers get snialler every year,
which means these electronics require even smaller components on the inside.Engineer; are looking for
creative ways to build these components,and they'ye turned their eyes to graphene,a superthin material,
made of carbon,that could change the future of electronics.
This year's Nobel Prize for Physics has been awarded to Andre Geim and Kostya Novoselov from the
University of Manchester,U.K.for the discovery of graphene.Graphdne isn't just small;it's "the thinnest
possible material in this world"says Novosclov.iJe calls it a “wonder material".It’s so thin that you would
need to stack about 25,000 sheets just to make a pile as thick as a piece of' ordinary white paper. If you were
to hold a sheet of graphene in your fingers,you'ci have no idea because you wouldn't be able to see it.
Carbon is one of the most abundant elements in the universe.Every known kind of life contains carbon.
Graphene is a sheet of earboti,but only one atom thick.You don't have to look far to find graphene一it's
all around you.
If you want this high-tech wonder stuff,all you need is a pencil,paper and a little adhesive tape.Use
the pencil to shade a small area on the paper,and then apply a small piece of adhesive tape over the area.
When you pull up the tape,you'll see that it pulls up a thin layer of some of the shading from your pencil.
That layer is called graphite,one of the softest mninerals in the world.
Now stick the same piece of tape on another sheet of paper and pull the tape up一there should be an
even thinner layer,this time left on the paper. Now imagine that you do this over and over,until you get the
thinnest possible layer of material on the paper. This layer would he only one atom thick,and you wouldn't
be able to see it. Graphite is made of layers of graphene.So when you get to the thinnest possible layer,
you've found graphene.
Craphene'S super strength lies in the fact that:_______.
A.it is the thinnest material in time world
B.it is made of the most abundant element in the world
C.it can help to make electronic components smaller
D.it helps engineers to produce more sensitive electronic product
[单选题]数据管理要与质量风险管理相适应,数据管理元素包括( )
A..行为控制
B.规程控制
C.技术控制
D.以上都是
[多选题]现场勘察应由工作票签发人或工作负责人组织，（）参加。
A.工作负责人
B.设备运维管理单位（用户单位）相关人员
C.检修（施工）单位相关人员
D.D安监人员.
[判断题]企业存款人开立的银行结算账户，自开立之日次日起办理收付款业务。
A.正确
B.错误
[判断题]包用专用列车的编组中作隔离或宿营的车辆不另计费，但用隔离车装运行李、包裹时则应按包车办理。
A.正确
B.错误
[多选题]下列交通事故责任的判定，正确的是？（
A.机动车辆变更车道与正常行驶的车辆发生交通事故，变道车辆负事故全部责任。
B.未与前车保持安全距离，追撞前车尾部的，后面车辆负事故全部责任。
C.进入环形路口的车未让已在路口内的车先行， 负事故全部责任
D.开关车门造成交通事故的，该车负事故全部责任。
[单选题]使用冰帽进行头部降温时，肛温
应维持在
A.30℃
B.33℃
C.34℃
D.35℃
[单选题]对树株的养护内容不包括( )。
A.看护
B.涂红涂白
C.合理修剪
D.成材树株更新
[单项选择]宪法规定，国家保障、巩固和发展的经济形式是( )。
A. 国有经济
B. 集体经济
C. 个体经济
D. 私营经济
[单选题]在建筑物、电气设备和构筑物上能产生电效应、热效应和机械效应,具有较大的破坏作用地雷属于( )。
A.球形雷
B.感应雷
C.直击雷
[单选题]装、拆接地线时，人体不准碰触（ ）。
A.接地线的接地端
B.接地线和未接地的导线
C.已接地的导线
D.接地通道
E.略
[多项选择]召开项目启动会议主要内容包括( )。
A. 宣布工作计划
B. 介绍项目团队成员
C. 介绍项目基本情况
D. 明确内部沟通方式
E. 开展项目实施中的指导
[单选题]轨道车出乘前应配齐技术资料、( )用品以及工具备品和易损零配件。
A.乘务人员
B.安全防护
C.车载信号
D.车辆检测
[判断题]救援人员在开展水域救援时，要合理编组，严格程序、采取正确救人方法，明确安全纪律和行动要求。( )
A.正确
B.错误
[单项选择]Mrs White gave music lessons at a school. She had a good voice, (36) some of her high notes sounded like a door that (37) oiling. Mrs White knew her (38) well, and took every (39) she could find to practise these high notes. As she (40) a small house, she could not practise (41) disturbing the rest of the family. So she usually went for long walks (42) the country road. But (43) she heard a car or a person (44) along the road, she stopped practising. She did not want to be heard, (45) she was very shy.
One afternoon, a fast open car came up behind her so (46) and so fast that she did not hear it (47) it was only a few yards from her. She (48) some of her highest and (49) notes at that time. As the car passed, she saw an anxious (50) come over its driver’s face. He stopped his car suddenly, (51) out and began to examine all the tyres
A. needn’t
B. didn’t dare
C. wanted
D. pointed out
