热门试题:
[多选题]不应采用缠绕的方法进行()或()。接地线应使用()固定在导体上。
A.接地
B.短路
C.专用的线夹
D.通用的线夹
[多选题]下列哪些施工检修种类是按照时间划分()。
A.日补充计划
B.临时补修计划
C.临点施工
D.临检作业
[单选题]Madrid was hailed as a public health beacon last November when it rolled out ambitious restrictions on the most polluting cars.Seven months and one election day later,a new conservative city council suspended enforcement of the clean air zone,a first step toward its possible demise.Mayor Jose Luis Martinez-Almeida made opposition to the zone a centrepiece of his election campaign,despite its success in improving air quality.A judge has now overruled the city's decision to stop levying fines,ordering them reinstated.But with legal battles ahead,the zone's future looks uncertain at best.Among other weaknesses,the measures cities must employ when left to tackle dirty air on their own are politically contentious,and therefore vulnerable.That s because they inevitably put the costs of cleaning the air on to individual drivers一who must pay fees or buy better vehicles一rather than on to the car manufacturers whose cheating is the real cause of our toxic pollution.It's not hard to imagine a similar reversal happening in London.The new ultra-low emission zone(Ulez)is likely to be a big issue in next year's mayoral election.And if Sadiq Khan wins and extends it to the North and South Circular roads in 2021 as he intends,it is sure to spark intense opposition from the far larger number of motorists who will then be affected.It's not that measures such as London's Ulez are useless.Far from it.Local officials are using the levers that are available to them to safeguard residents'health in the face of a serious threat.The zones do deliver some improvements to air quality,and the science tells us that means real health benefits-fewer heart attacks,strokes and premature births,less cancer,dementia and asthma.Fewer untimely deaths.But mayors and councillors can only do so much about a problem that is far bigger than any one city or town.They are acting because national governments一Britain s and others across Europe-have failed to do so.Restrictions that keep highly polluting cars out of certain areas-city centres,。school streets",even individual roads-are a response to the absence of a larger effort to properly enforce existing regulations and require auto companies to bring their vehicles into compliance.Wales has introduced special low speed limits to minimise pollution.We re doing everything but insist that manufacturers clean up their cars.
Which is considered a weakness of the city-level measures to tackle dirty air?
A.They are biased against car manufacturers.
B.They prove impractical for city councils.
C.They are deemed too mild for politicians.
D.They put too much burden on individual motorists.
[判断题]高原双源动力集中动车组内燃动车组轴承密封结构区域不许有积油或大片油渍。
A.正确
B.错误
[单选题]用试电笔测试熔断器两个连接螺栓时,如( )说明熔断器已烧。
A.两端均无电
B.两端均有电
C.两个螺栓松动
D.一端有电,另一端无电
[多选题]M9 蓝钻标配探头包括( )
A.C5-1s
B.L12-4s
C.SP5-1s
D.V11-3Ws
[单选题]Internet主要由四部分组成,其中包括路由器、主机、信息资源与()。
A.数据库
B.管理员
C.销售商
D. 通信线路
[判断题]二次系统现场工作开始前,应检查已做的安全措施是否符合要求,运行设备和检修设备之间的隔离措施是否正确完成,工作时还应仔细核对检修设备名称,严防走错位置。
A.正确
B.错误
[单选题]由于各类操作系统本身的架构及运行过程中用户授权访问限制各不相同,相对来说,(____)操作系统较难被病毒感染。
A.DOS
B.Windows
C.UNIX
D.NT
[单项选择]用于磷化氢熏蒸环境中的安全监测仪器是()。
A. 毒气检测仪
B. 磷化氢检测管
C. 磷化氢检测仪
D. 磷化氢报警仪
[单选题]高铁区段在设有引导信号的线路所通过信号机引导发车,司机在确认引导信号显示正确,发车条件具备后,在显示器上“绿色许可证号”栏输入(),进行“绿色许可证”按键操作。司机须严格控制列车以不超过20km/h运行到下一架信号,按其显示运行。
A.99
B.绿色许可证号
C.55
[单项选择]《酒后》是几幕剧?()
A. 多幕
B. 三幕
C. 独幕
D. 两幕
[单选题]431游梁式抽油机井的参数中,冲次的单位是()。
A.(A)次/min
B.(B)转/min
C.(C)次/d
D.(D)r/d
[单项选择]测量前囟大小正确的方法是()
A. 二对边中点连线长度
B. 相邻二边的长度
C. 二对角线的长度
D. 一侧边的长度
E. 两侧边的长度之和除以2
[单选题]《铁路旅客运输规程》第九条规定,下列哪一项是旅客的义务( )。
A.对损害他人利益和铁路设备、设施的行为有权制止、消除危险和要求赔偿
B.依照规定收取运输费用
C.对所造成铁路或者其他旅客的损失予以赔偿
D.对损害他人利益和铁路设备、设施的行为有权制止、消除危险和要求赔偿
[单项选择]在下列S-S曲线图中,B-C段表示()。
A. 自然拉伸区
B. 屈服区
C. 细颈拉伸区
D. 断裂区
[单项选择]Unfortunately, the woman's hat ______ my view of the stage.
A. blocked up
B. obstructed
C. prevented
D. interfered
[单项选择]
The motorcar
Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of urban travel in the foreseeable future.
The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, safer, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types.
Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion. One proposed solution to this problem is the automated highway system.
When the auto enters the highway system, a retractable (可伸缩的) arm will drop from the auto and make contact with a rail, which is similar to those powe
A. its power source
B. its driving system
C. its monitoring system
D. its seating capacity
[单项选择]临床上检测抗原最常用的方法()。
A. 双抗体夹心法
B. 间接法
C. 竞争法
D. 应用亲和素-生物素的ELISA
E. 捕获法
[填空题]编组站、区段站在到发线、调车线以外的线路上停留车辆,不进行()时,应连挂在一起,并须拧紧两端车辆的人力制动机,或以铁鞋(止轮器、防溜枕木等)牢靠固定。
[单选题]铆钉在钢结构受力中,是靠( )达到传递外力的目的。
A.A.剪力
B.B.拉力
C.C.摩擦力
D.D.压力和摩擦力
[单选题]减少事故损失的安全措施一般遵循一定的优先原则。下列安全技术措施中,属于优先原则排序的是()
A.个体防护、隔离、避难与救援,设置薄弱环节
B.设置薄弱环节、个体防护、隔离、避难与救援
C.隔离、设置薄弱环节、个体防护、避难与救援
D.个体防护、设置薄弱环节。避难与救援、隔离
[单选题]水产品原料的蛋白质易被人体消化吸收,消化率高达()。
A.83-85%
B.85- -87%
C.87-89%
D. 89-91%
[单选题]属于主观方面的健康资料是( )
A.体温39℃
B.胸闷、气短
C.呼吸急促
D.口唇发绀
[单选题]下面不属于作业层班组的职责是( )。
A.建立班组安全管理台帐
B.组织开展班组安全教育培训,负责落实站班会机制
C.依权限负责办理施工作业票、工作票(如需要)
D.编制施工方案
[判断题]车轴报废时,该车所有部件报废
A.正确
B.错误
[单选题]《蒙特利尔公约》要求各缔约国承允对公约规定的罪行采取何种处罚( )。
A.死刑
B.有期徒刑
C.无期徒刑
D.按各缔约国国内法给予严厉惩罚
[简答题] 声幅测井找窜时,声波幅度的衰减与哪些因素有关?
[单选题] 如果EDl组件电流降低或()增加,离子交换树脂的工作前沿将向出水端移动,抛光层树脂总量减少。
A. 电压
B. 功率
C. 电压梯度
D. 给水离子总量
[填空题]托运危险货物的,应当向货运经营者说明()等情况,并严格按照国家有关规定包装,设置()
[多选题]中国无产阶级的“特殊优点”在于( )。
A.不占有任何生产资料
B.人数虽少,但比较集中
C.深受帝国主义、封建主义和官僚资本主义的三重压迫
D.与农民有着天然的联系
[简答题]䐅41.中性点非直接接地系统中,电压互感器二次绕组三角开口处并接一个电阻的作用是什么?高级工
[多选题]地下配电站,宜装设( )装置,配备足够数量的消防器材或安装自动灭火系统。
A.测温
B.通风
C.排水
D.除湿
[简答题]《国家电网有限公司95598客户服务业务管理办法》界定为重要投诉的有哪些情形?
[判断题]过渡配合可能有间隙,也可能有过盈,因此,过渡配合可以算间隙配合,也可以算过盈配合。
[判断题]蓄电池观光车的控制系统应当具有欠电压、过电流、过热和过电压保护功能。( )
A.正确
B.错误
[单选题]队列研究所具有的特点是:
A. 按是否患某病而分组
B. 容易产生回忆偏倚
C. 结论的可靠性不如病例对照研究
D. 可直接计算出相对危险度(RR)
E. 一个研究可涉及多个危险因素
[单选题](单选题)、刘某发现施工人员有违反安规的行为,应该( )
A.提醒注意,但无需制止
B.立即制止,经纠正后方可恢复工作
C.事不关己,无需理会
D.立即向上级领导汇报