热门试题:
[单选题]非增压舱航空器的机上人员必须使用氧气的高度是()m以上。
A. 3600
B. 4000
C. 4500
D. 5000
[单选题]肌肉长度基本保持不变,不发生关节角度的变化,但张力发生改变的肌肉收缩方式是:
A. 等长收缩
B. 向心性收缩
C. 离心性收缩
D. 等速收缩
E. 等张收缩
[单项选择]具有活血通经,祛瘀止痛之功的药物是( )
A. 鸡血藤
B. 丹参
C. 红花
D. 月季花
E. 泽兰
[单选题](47345)为确保路堤稳定,在路堤坡脚和取土坑(或排水沟)之间留出一道天然地面,称为护道。护道宽度 不少于( ),并向外做成2~4%的斜坡。(1.0分)
A.1m
B.2m
C.3m
D.4m
[单项选择]不小心把刚刚修改完成的“《串联和并联》教案设计(修改后)”删除掉了,可能在哪个地方或通过何种方式能找回该文件()。
A. 我的文档
B. 存放该文件的原目录下
C. 关闭电脑后以安全模式启动
D. 回收站
[简答题]在停电作业验电时,验电必须使用相应电压等级的合格的验电器。验电时必须戴绝缘手套并逐相进行,验电必须设专人监护。同杆塔设有多层电力线时,必须()。
[单项选择]离体肝线粒体中加入氰化物和丙酮酸,其P/O比值是
A. 3
B. 2
C. 0
D. 1
[单项选择]喷涂时喷咀与涂面距离为()厘米左右,太近会产生流挂,太远又会发生喷雾干结现象。喷涂时,喷枪喷咀与涂面应成()。
A. 20;直角
B. 30;锐角
C. 20;钝角
[多选题]索道架设按施工方案选用()等设备及部件。
A.承力索
B.拉线
C.驱动装置
D.支架
E.略
F.略
[单选题]电动工具的电气部分维修后,应进行绝缘电阻测量或绝缘耐压试验。
A.正确
B.错误
C.略
D.略
E.略
F.略
[单项选择]色环上色相距在案120°左右的对比称为()
A. 互补色相
B. 对比色相
C. 中差色相
D. 邻接色相
[单选题]走合期保养是新造或大修轨道车在出厂初期行驶( )进行的特定性维护工作,其内容在合同质量保证期条款中约定。
A.1000±500km
B.2500±500km
C.1000km
D.2500km
[单选题]对公通知存款部分支取,支取金额必须大于( )。( )
A.5 万元
B.10 万元
C.15 万元
D.20 万元
[填空题]A mating group consists of two females and one male.
[单项选择]属于医用特种胶片的是
A. 清洁用胶片
B. 激光相机成像胶片
C. 乳腺摄影用正色胶片
D. 感绿胶片
E. 感蓝胶片
[单选题]工务、电务、供电部门应利用天窗时间对列车碰撞异物地点前后( )km范围内的设备进
行重点检查。
A.2
B.5
C.10
[单选题]坚定不移推进安全( )化、( )化、( )化建设。
A.标准、规范、专业
B.综合、一体、规范
C.科学、合理、规范
[单选题]关于头虱错误的是
A.多见于妇女、儿童
B.虱咬处可见红斑、丘疹
C.瘙痒不剧烈
D.抓破后有血痂
E.常伴臭味
[多选题]在微软办公软件Excel中,单元格的自动填充柄具有自动填充功能,可完成()。
A.数字和文本的移动
B.数学统计公式的复制
C.数字和文本的复制
D.数字和日期的计数
E.数字和文本的求和
[多选题]采煤工作面移动刮板输送机时,必须有( )的安全措施。
A.防止冒顶
B.防止顶伤人员
C.防止损坏设备
D.防止输送机弯曲
[单选题] 化疗药物外渗的处理原则,哪项不妥:( )
A.立即停止药物输人,保留注射针头,回抽残留药液后拔除,避免按压
B.局部使用2%利多卡因5m1+地塞米松5mg+生理盐水10ml(用量根据外渗范围)。
C.注意防冻伤,早期局部热敷6~12
H,
D.保持局部皮肤的完整性,一旦破溃不可涂抹任何膏剂,应清创.无菌换药
[判断题]接户、进户装置上的低压带电工作和单一电源低压分支线的停电工作按口头命令执行。( )
A.正确
B.错误
[填空题]
The Roadrunner
The roadrunner (走雀) lives in the desert zone of the southwestern United States and northern Mexico.
(1) People gave it its name because they usually see it running across a road, but of course, it spends more time among the plants of the desert than it does on roads.
The roadrunner is quite a large bird—about 45 centimeters long and 25 centimeters high.
(2) It holds its head straight out in front and its tail sticks straight out in back. It takes long steps and can run 30 kilometers an hour.
It eats an amazing variety of food. Although it eats plants once in a while, it is mostly a meat eater. Most of its diet is insects, but it also catches birds, mice, and other small animals. It is even brave enough to catch snakes and black widow spiders (蛛).
(3) When he finds one, he gives her presents—a snake to eat or a tiny branch of a tree to use in building a nest. Then they
[单选题](47833)在有轨道电路区段,道岔转辙部分和可动心轨部分拨道时,应( )要求配合。(1.0分)
A.提前口头通知电务人员
B.B.提前书面通知电务人员
C.起道时通知电务人员
D. 起道后通知电务人员
[多选题]在有限空间作业场所,应配备安全和抢救器具,如( )以及其他必要的器具和设备。
A.呼吸器具
B.通信设备
C.梯子
D.绳缆
[单选题]为了防止蒸汽型双效制冷剂因蒸汽压力过高而出现结晶,应控制蒸汽压力使高压发生器溶液出口温度不超过()℃。
A.100
B.200
C.160
[单项选择]I can hardly believe it, it's {{U}}amazing{{/U}}.
A. over and over
B. unconscious
C. unreliable
D. incredible
[单选题]由酸性物质和碱性物质与泡沫稳定剂相互作用而形成的泡沫群,是( )泡沫。
A.抗溶性
B.氟蛋白
C.化学
D.轻水
[判断题]公安机关严禁将一切用房出租或者无偿提供给外部人员或者其他单位使用。( )
A.正确
B.错误
[填空题]Cell-Phone Bans While Driving Have More
Impact in Dense, Urban Areas
A The study,
conducted by Sheldon Jacobson, a professor of computer science and the director
of the simulation and optimisation laboratory at Illinois, analysed the
relationship between pre-and post-law automobile accident rates using public
data from 62 counties in New York. Jacobson and co-researchers Alexander
Nikolaev and Matthew Robbins published their results in an article titled
Evaluating the Impact of Legislation Prohibiting Hand-Held Cell Phone Use While
Driving, which will appear in a forthcoming issue of the Journal Transportation
Research Part A: Policy and Practice.
B The team found
that after banning hand-held cell phone use while driving, 46 counties in New
York experienced lower fatal accident rates, 10 of which did so at a
statistically significant level, while all 62 counties experienced lower
personal injury accident rates. They also discovered that the personal injury
accident rate decrease was more substantive in counties such as Bronx, New York
and Queens, where there was a high density of licensed drivers rather than in
sparsely populated areas of upstate New York. ’What that suggests is, if you
have a congestion of cars and you’re distracted, you’re more likely to hit
someone,’ Jacobson said. ’If you have a lower congestion of cars, you’re still
distracted, but you’re less likely to hit anyone because there are less people
to hit. It’s simple probability.’ Driver distraction is thought to be the cause
of nearly 80 per cent of automobile accidents in the U.S., resulting in about
2,600 deaths, 330,000 injuries and 1.5 million instances of property damage
annually.
C Although a ban on hand-held cell phone use
while driving in rural areas has less of an impact on driver safety, Jacobson
says that doesn’t necessarily mean the ban itself is worthless. ’Hand-held cell
phone bans are very valuable in high-density urban areas, but less so in
lower-density rural areas,’ Jacobson said. ’But that doesn’t mean they have no
impact in rural areas. It just means that such legislation is less likely to
have an impact on driver accident rates.’
D Jacobson’s
study differs from other studies in that, rather than focusing on reaction times
of simulated drivers in lab setting, it analysed publicly available data of
accident rates published by the New York State Department of Motor Vehicles. To
allow for a proper comparison between time periods, the years 1997 to 2001 were
treated as the pre-law time period, and the years 2002 to 2007 were considered
as the post-law time period. ’Nobody’s done a study like this before,’ he said.
’Everything prior to this is a micro-analysis of reaction time in laboratories
by researchers.’ The challenge, Jacobson said, was getting the right data to
analyse. ’The best state that had the data to analyse was New York,’ he said.
’They’ve had the hand-held cell phone ban in place since 2001. So we had a lot
of data.’
E Jacobson said one of the limitations of the
study is extrapolating the data from New York state and projecting it onto the
nation at large. ’That’s fraught with problems, but these are limitations we
acknowledge,’ he said. ’Every state is unique, but the overall conclusions still
stand to reason.’ Jacobson, who also holds appointments as a professor of
industrial and enterprise systems engineering, of civil and environmental
engineering, says the holy grail of data sets to analyse would be the property
damage data collected by insurance companies. Jacobson says the difference
between his study and one recently published by the Highway Loss Data Institute,
an affiliate of the Insurance Institute for Highway Safety, is that he used
publicly available data and the number of licensed drivers as a proxy for
accident prediction. (The insurance industry-backed report studied pre- and
post-ban insurance claims from accidents in California, Connecticut, New York
and Washington, D.C. It contends that state laws banning the use of cell phones
while driving didn’t reduce the number of vehicle crashes.) If the property
damage data were available to Jacobson and his co-researchers, ’We could come up
with a more definitive statement,’ he said.
F Another
challenge for Jacobson and his team was how to standardise accident data across
the counties. Their solution was to use the number of licensed drivers and
compare the statistical inferences to licensed-driver density. ’Measuring the
throughput of cars is very difficult,’ Jacobson said. ’As a result, using the
number of licensed drivers is a reasonable way to standardise, and
licensed-driver density provided an interesting measure to compare the
counties.’ The measures of traffic safety considered in the study are the number
of fatal automobile accidents per 100,000 licensed drivers per year and the
number of personal injury accidents per 1,000 licensed drivers per year,
Jacobson said. For the purpose of analysis, the personal injury accident rate
proved to be a more appropriate measure. ’The trend that we saw was that
high-density driving areas tended to have a more precipitous drop in the number
of fatalities and accidents after the ban was implemented than in lower- density
areas,’ Jacobson said. ’This was more pronounced for personal-injury rates than
it was for fatality rates.’
G Despite the exponential
growth in cell phone subscribers, Jacobson says that all the evidence suggests
that hand-held cell phone bans while driving are worthwhile. ’All the evidence
suggests hand-held cell phone bans while driving are a good thing, and this is
more evidence to that effect,’ he said. ’But it doesn’t establish it
definitively. There’s still more work to be done, but this helps to further
clarify the picture.’Paragraph G
[单选题]虚拟电厂依托现代化的信息通信和先进的智能技术,把多类型、多能流、多主体资源以()为中心相聚合
A.煤
B.多能源
C.电
D.新能源
[单项选择]Sciencedirect数据库是由哪家公司出版发行的()。
A. John Wiley
B. EBSCO
C. Elsevier
D. Janes
[单选题]工作票的有效期,以批准的()期为限。
A.检修
B.报修
C.当天消缺
D.一年
E.略
F.略
[多项选择]班级沟通的种类有()。
A. 语言沟通
B. 物质沟通
C. 非语言沟通
D. 非物质沟通
E. 精神沟通