热门试题:
[单项选择]光电直读光谱仪有（）种入射狭缝。
A. 一
B. 二
C. 三
[单选题]安装或拆除蓄电池连接铜排或线缆时，应使用经（）处理的工器具，严禁将蓄电池正负极短接。
A.加固
B.镀铜
C.绝缘
D.改装
[判断题] 钢轨锁定不良,昼夜温差.季节温差造成窜轨严重,轨端绝缘顶死,管垫拉破,绝缘接头应安装窄扣件却安装了一般扣件或轨枕扣件螺母松动弹条碰鱼尾板,均会产生后红光带( )
A.正确
B.错误
[单选题]假设某公司股票当前的市场价格是每股80元；该公司上一年末支付的股利为每股1元，以后每年的股利以一个不变的增长率2%增长；该公司下一年的股息发放率是25%。则该公司股票下一年的市盈率为（ ）。
A.20．88
B.19．61
C.17．23
D.16．08
[判断题]变更控制系统包括了从项目变更申请、变更评估、变更审批到变更实施的文档化流程。
[单项选择]The idea that it is the business of governments to cheer up their citizens has moved in recent years to centre-stage. Academics interested in measures of GDH (gross domestic happiness) were once forced to turn to the esoteric example of Bhutan. Now Britain’s Conservative-led government is compiling a national happiness index, and Nicolas Sarkozy, France’s president, wants to replace the traditional GDP count with a measure that takes in subjective happiness levels and environmental sustainability.
Martin Seligman, a former president of the American Psychological Association, would approve. He has uncovered various structured ways of perking people up, all of them, he insists on the very first page of his new book, "grounded in careful science". Much of this book consists of the results of various complex tests and interventions designed to reduce depression and anxiety and increase resilience and self-discipline. Writing a "what-went-well-today-and-why" diary for a week, for examp
A. has moved to centre-stage
B. is more important than GDP
C. is a subjective term to measure happiness
D. is an important issue that attracts people’s attention
[单项选择]排气式避雷器的最小短路电流应按照( )计算。
A. 雷季电力系统最小运行方式，不包括非周期分量
B. 非雷季电力系统最小运行方式，不包括非周期分量
C. 雷季电力系统最小运行方式，包括非周期分量
D. 非雷季电力系统最小运行方式，包括非周期分量
[判断题]直流电动机的调速方法有串电阻调速、削弱磁场调速和调压调速三种。
A.正确
B.错误
[单选题]车间/工区接入监测网的方式应采用点对点通过不低于( )Mbit/s通道连接到电务段局域网中
A.1
B.2
C.3
D.4
[判断题]为了使机房的空气流通，不应关闭门窗
A.正确
B.错误
[判断题]在同杆塔架设的多回线路上放线或撤线、紧线时，应采取措施防止导线或架空地线由于摆（跳）动或其他原因而与带电导线接近至危险距离以内。
A.正确
B.错误
[单选题](467273)红外吸收池和紫外可见分光光度计吸收池( )。(1.0分)
A.都是玻璃的
B.一样
C.不一样
D.都是石英的
[填空题]凡在路局施工（维修）（ ）中公布的项目，均应在《行车设备施工登记簿》内办理登销记。
[判断题]采用机车运输时,列车或单独机车都必须前有照明、后有红灯。( )
A.正确
B.错误
[多选题]变压器的调压方式有()。
A.无载调压
B.有载调压
C.改变二次侧匝数调压
D.改变负荷调压
[判断题]为保护信访人的隐私，不应建立全国信访信息系统。
A.正确
B.错误
[多选题] 冬季坑、槽的施工方案中应根据土质情况制定边坡防护措施施工中和化冻后要检查边坡稳定出现( )等情况要及时采取措施。 (1.0分)
A. 护坡桩变形
B. 土质疏松
C. 冻土
D. 裂缝
[判断题]工作负责人应提前知晓工作票内容，并做好工作准备。
A.正确
B.错误
[单项选择]Her boss ______ her to work day and night.
A. made
B. had
C. let
D. forced
[简答题]Vmax≤120km/h的正线及到发线轨距、水平、高低、轨向（直线）、三角坑临时补修容许偏差管理值是多少？
[多选题]下列不能适用治安调解的案件有( )。
A.张某盗窃李某的钱包被李某当场发现,后被民警带到公安机关,张某要求对该案进行调解
B.万某因对自己81周岁的岳母长期积怨,忍无可忍将岳母打成轻微伤,其妻子报案后,被公安机关调查,其妻要求调解,但其岳母不同意
C.嫖客苏某与卖淫女赵某在宾馆嫖宿,嫖宿后因嫖资支付发生纠纷,争吵之时被公安派出所民警抓获,二人要求调解
D.张某侮辱李某,李某遂到公安派出所报案,张某知道后,来到李某家将其打成轻微伤,张某要求调解
[判断题]红外测温仪每次用后，应用清洁的压缩空气吹除表面尘埃，轻轻用软刷刷除玻璃清洁剂浸湿，可用溶剂清洗镜头。
[单项选择]湿氯气适用的垫片材质（）。
A. 三元乙丙橡胶
B. 柔性石墨复合垫
C. 石棉橡胶垫片
D. 膨体四氟
[单选题] 脚手架的脚手板应满铺，不准有空隙和（ ）。
A. 搭接
B. 探头板
C. 重叠
D. 交叉
[单项选择]心电图上表现为心室律不规则的是（）
A. 阵发性室上性心动过速
B. 心房扑动伴2：1传导
C. 一度房室传导阻滞
D. 窦性心动过速
E. 二度Ⅰ型房室传导阻滞
[填空题]
Dung to Death
Fields across Europe are contaminated with dangerous levels of the antibiotics given to farm animals. The drugs, which are in manure sprayed onto fields as fertilizers, could be getting into our food and water, helping to create a new generation of antibiotic-resistant "superbugs".
The warning comes from a researcher in Switzerland who looked at levels of the drugs in farm slurry.
(46) .
Some 20,000 tons of antibiotics are used in the European Union and the US each year. More than half are given to farm-animals to prevent disease and promote growth.
(47) .
Most researchers assumed that humans become infected with the resistant strains by eating contaminated meat. But far more of the drugs end up in manure than in meat products, says Stephen Mueller of the Swiss Federal Institute for Environmental Science and Technology in Dubendorf.
(48) .
With millions of tons of
[单项选择]该公司2002年12月15日采购的甲原材料的单位成本为( )元。
A. 363.2
B. 363.85
C. 370
D. 410
[判断题]LED色灯机构发光二极管损坏数量达到20%时，会影响信号显示的规定距离。
A.正确
B.错误
[单选题]影响电网调度通信业务的通信检修，应避开( )时间段。
A.电网检修高峰
B.电网负荷高峰
C.电网故障处置
D.通信检修高峰
[单项选择]We know that, for the most part, the bigger a man’s muscles are, the stronger he is. Can it be considered, then, that the larger the brain a man has, the cleverer he is The answer is no.
There are only two animals that have larger brains than man, the whale and the elephant. Yet, according to his size, man’s brain is larger. Man’s brain usually weighs about three pounds or a little more, and this is about one-fortieth of the weight of his whole body. The whale’s body, on the other hand, is a thousand times heavier than its brain, while the elephant’s body is about five hundred times as heavy.
But a man who has a large brain is not necessarily cleverer than one whose brain is smaller. We know that geniuses have existed who have had very large brains, but there have been others whose brains were rather small.
We do not understand why some people are cleverer than others. Whether our brains are large or small is less important than that we try to do our very best.
Whethe
A. large brains
B. genius
C. hard work
D. cleverness
[单项选择]A great deal of attention is being paid today to the so-called digital divide--the division of the world into the info (information) rich and the info poor. And that divide does exist today. My wife and I lectured about this looming danger twenty years ago. What was less visible then, however, were the new, positive forces that work against the digital divide. There are reasons to be optimistic.
There are technological reasons to hope the digital divide will narrow. As the Internet becomes more and more commercialized, it is in the interest of business to universalize access--after all, the more people online, the more potential customers there are. More and more governments, afraid their countries will be left behind, want to spread Internet access. Within the next decade or two, one to two billion people on the planet will be netted together. As a result, I now believe the digital divide will narrow rather than widen in the years ahead. And that is very good news because the Inter
A. providing financial support overseas
B. preventing foreign capital’’ s control
C. building industrial infrastructure
D. accepting foreign investment
[单项选择]2×2列联表中的χ2统计量的自由度为（）
A. 0
B. 1
C. 2
D. 3
[单项选择]可以以低价使产品尽快为市场所接受，并借助大批量销售来降低成本，获得长期稳定的市场地位的价格策略是( )。
A. 渗透定价法
B. 撇脂定价法
C. 按地点差别定价
D. 按产品的版本差别定价
[单项选择]在金属网下割煤时，采煤机的滚筒不应靠近顶板截割，以免割破顶网。一般要求留（）mm左右厚度的顶煤。
A. 100
B. 300
C. 500
[单选题]各分支机构相关部门每个工作日应检查支付清算平台截止上一工作日尚无法处理的来账，及时推进处理完成，原则上应于（ ）个工作日内处理完成。
A.1
B.2
C.5
D.10
[单项选择]中心血管通路装置尖端应该位于（）
A. 上腔静脉
B. 下腔静脉
C. 右心房
D. 上腔静脉的下1/3到上腔静脉与右心房的连接处
E. 颈外静脉
