热门试题:
[单项选择]复列式光电门的光电装置距轿厢地坎（）米高处装一对。
A. 0.5
B. 0.3
C. 0.8
D. 1.0
[多选题]个人合约解约交易用于______，在经联网核查人脸识别通过后的批量合约解约。
A.外汇宝
B.个人资金归集
C.存金通、存金通2号
D.账户贵金属、金交所代理、理财产品等零余额合约
[填空题]若已知a＝10，b＝20，则表达式!a＜b的值为 。
[单选题]甲醇精馏单元水联运,一般采用( )水联运。
A.原水
B.氢钠水
C.循环水
D.锅炉水
[判断题] 间歇性精神病人在病发时犯罪,不负刑事责任。
A.正确
B.错误
[不定项选择题]共用题干
More Than 8 Hours Sleep Too Much of a Good Thing
1 Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
2 Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling refreshed after a night's sleep than 8-hour sleepers.
3 These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside, more than 8 hours a night.He added that“it might be a good idea”for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cautioned that more research is needed to confirm this.
4 Previous studies have shown the potential dangers of chronic shortages of sleep一for instance,one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
5 For the current report,Kripke reviewed the responses of 1,004 adults to sleep questionaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems.Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
6 Kridke found that people who slept between 9 and 10 hours each night were more like-ly to report experiencing each sleep problem than people who slept 8 hours.In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed.“It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake.”he said.
Long sleepers are reported to be more likely to______.
A.fall asleep again
B.become more energetic the following day
C.sleep less than 7 hours
D.confirm those serious consequences
E.suffer sleep problems
F.sleen more than 8 houlrs
[判断题]灭火救援现场迷失方向时可以寻找相对安全的空间,若无法找到,应停留在原地等待救援,减少气瓶的消耗。( )
A.正确
B.错误
[多选题]依据《中国南方电网有限责任公司电力安全工作规程》(Q/CSG510001-2015)第6.9.8条规定: 工作需要延期时,应经工作许可人同意并办理工作延期手续。第一种工作票应在工作批准期限前( )(特殊情况除外),由工作负责人向工作许可人申请办理延期手续。除紧急抢修工作票之外的只能延期( )。
A.1h
B. 2h
C.一次
D.二次
[单选题]高危和人员密集单位应当()至少进行1次应急预案评估。
A.海半年
B.海年
C.每2年
D.海5年
[简答题]一个光学生物传感器主要包括那几个组成部分？
[单选题]精英卡收取的年费标准为（ ）。
A.免费
B.40元
C.80元
D.300元
[不定项选择题]共用题干
Ants Have Big Impact on Environment as“Ecosystem Engineers”
Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as“ecosystem engineers”and predators.The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.
Firstly,through moving of soil by nest building activity and by collecting food they af-fect the level of nutrients in the soil.This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.
Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.
Dirk Sanders,an author of the study from the university's Centre for Ecology and Con-servation,said:“Ants are very effective predators which thrive in huge numbers. They're al-so very territorial and very aggressive,defending their resources and territory against other predators. All of this means they have a strong influence on their surrounding area.”
“In this research,we studied for the first time how big this impact is and the subtleties of it.What we found is that despite being predators,their presence can also lead to an in-crease in density and diversity of other animal groups. They genuinely play a key role in the local environment,having a big influence on the grassland food web,”Sanders said.
The study,carried out in Germany,studied the impact of the presence of different com-binations and densities of black garden ants and common red ants,both species which can be found across Europe,including in the UK.It found that a low density of ants in an area in-creased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.
Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counter-acting the positive influence via ecosystem engineering.”
Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers.Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obvi-ously reduces its richness. However,it is not clear how such disturbance damages the main-tenance of ant services to the ecosystem. Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.
As predators,ants______.
A.prey on small as well as large animals
B.collect nutritious food from the soil
C.collect food as decomposers
D.prey on species much higher up the food chain
[判断题]高压泵电机的电流是高压泵性能的条件之一。( )
A.正确
B.错误
[单项选择]在平面直角坐标系中，将两条不平行的直线必定交于一点，把两条直线的方程联立求解，得到的解是一个X值和一个Y值就是（）。因为这个点的坐标X值和Y值能使两个直线方程都成立，这就说明这个点既在一条直线上，也在另一条直线上。
A. 其中一条直线上的点的坐标
B. 其中另一条直线上的点的坐标
C. 这两条直线的公共点也就是交点的坐标
D. 不属于这两条直线的点的坐标
[单项选择]原发性肝癌患者的疼痛牵涉到右肩提示
A. 癌块生长迅速
B. 癌块压迫肝管
C. 肿瘤侵犯横膈
D. 肿瘤液化、坏死
E. 肿瘤胸膜转移
[简答题]一代武术宗师、功夫影帝、截拳道武道哲学创立人、好莱坞首位华人演员是？
[多选题]灭火救援中被火围困或在浓烟中迷失方向时如何自救（）。
A.淋湿全身
B.到处走动
C.利用落水管
D.绳索自救
[多选题]磁力吸盘电钻的磁盘平面应（），进行侧钻或仰钻时，应釆取防止失电后钻体坠落的措施。
A.光滑
B.平整
C.干净
D.无锈
[单选题]下列无线电定位系统中，定位误差最小的是：
A.NDB/NDB
B.VOR/VOR
C.VOR/DME
D.DME/DME
[多选题]《普速铁路行车组织规则》规定，（ ）应执行本规则。
A.国铁控股的合资铁路公司
B.委托集团公司运营管理的铁路
C.与国铁接轨的非国铁控股的合资铁路公司
D.与国铁接轨的地方铁路
[单选题]列车的种类、列车中车辆的去向、编组内容、车组和车辆的编持顺序，应符合( )的规定。
A.《技规》
B.列车运行图
C.列车编组计划
D.《站细》
[单选题]“三同时”是生产经营单位安全生产的( )措施，是一种事前保障措施。
A.重要保障
B.安全管理
C.安全生产
[判断题]积雪熔化易侵蚀电气内部，影响绝缘降低甚至造成停电事故。
[单选题]动火工作终结后，工作负责人、动火执行人的动火工作票应交给（ ），签发人将其中的一份交工区。
A.消防监护人
B.动火工作票签发人
C.工区
D.运维许可人
[多选题]根据《国家电网有限公司基建安全管理规定》，下列关于施工企业施工管理部门职责说法正确的是（）。
A.编制实现公司年度安全工作目标的具体要求和措施
B.协助本企业技术负责人组织安全教育培训
C.组织协调现场总平面的规划、布置
D.负责项目安全文明施工标准化管理
[多选题]（ ）时，将抱闸车辆及时摘下，并通知车辆部门派人处理。对抱闸车辆摘下后的列车，要及时安排列车开行。
A.车辆车轮踏面擦伤
B.缺损过限
C.车站人员不能判断
D.关门车不符合规定
[单选题]起讫于同一已知点和已知方向的导线称为：
A.附合导线
B.结点导线网
C.支导线
D.闭合导线
[单选题] 下列各项中属于产品固有特性的是( )。
A.价格
B.噪音
C.保修期
D.礼貌
[单项选择]社会化过程不包括（）。
A. 原有状态阶段
B. 调整阶段
C. 碰撞阶段
D. 适应阶段
[判断题]引导接车时,特定车站(进站信号机前为大上坡或有分相,速度难以掌握的车站)为监控数据中已做标记的进站或接车进路信号机。( )
A.正确
B.错误
[多项选择]为增强金合金瓷金结合，可采用的方法（）
A. 喷砂
B. 预氧化
C. 超声清洗
D. 除污
E. 电解蚀刻
[单选题]高层建筑火灾扑救中,第一出动力量按五辆消防车为一战斗编成时,通常可选择重型水罐消防车、高(中)低压泵水罐消防车、( )、举高喷射消防车和抢险救援消防车等。(中)
A.举高消防车
B.泡沫消防车
C.排烟消防车
D.城市主战消防车
[填空题]《南昌局集团公司南昌客运段处置长大隧道、特大桥突发事件应急预案》规定，旅客疏散：疏散过程中的安全防护。 疏散时，列车乘务员应迅速开启临近的隧道()的车门(上下行列车均为列车运行方向的右侧车门)，（如发生火灾、爆炸事故）疏散时，列车乘务员还应指导旅客用湿毛巾、手帕、衣物等捂住口鼻。
[判断题]各省（自治区、直辖市）颁发的老年人优待证中任何一种有效证件均可作为免费乘坐济南地铁优待证件。（ ）
A.正确
B.错误
[判断题]新建线路和切改区段在投运后1个月内，每月应进行1次全面巡视，之后执行正常巡视周期。（）
A.正确
B.错误
