热门试题:
[单项选择]Refrigeration (冷藏) is one of the most important means of keeping food. Refrigeration makes anything cold. Scientists and engineers have discovered many means of making things cold.
One way is to allow water, or another liquid, to evaporate (蒸发). Evaporation cools a liquid and the liquid cools the food.
Cold can also be produced by passing a gas through a small hole. Gases are made up of molecules (分子). Before the molecules pass through the small hole, they are close together. They are also moving quickly. Afterwards they are further apart and moving more slowly. Because the molecules are moving slowly, the gas is cool. The slower the molecules move, the cooler the gas will be. If the molecules move very slowly the gas changes into a liquid. Liquid oxygen can be made by passing it through a small hole.
The temperature of a gas ______ .
A. changes with the width of a hole
B. sometimes depends on how close together its molecules are
C. has something to do with the molecules that makes it up
D. is always connected with the speed at which its molecules go
[单选题]需要对客运营业办理限制修改的,由各铁路局报部运输局,定期在《铁路客货运输专刊》上统一修改《铁路客运运价里程表》。
A.《铁路客运运价里程表》
B.《票价表》
C.《运价表》
D.《时刻表》
[单选题]个人保安线由( )。
A.作业人员自装自拆
B.工作许可人装拆
C.工作负责人装拆
D.专责监护人装拆
[单选题]车站票务备品的申领、更换由()统一负责。
A.站务中心
B.(副)值站
C.当班值站
D.客运值班员
[判断题]K线分为阳(黑)线和阴(红)线两种。()
[单选题]EH36Z35钢种色唛标识颜色为()
A.黄色
B.蓝色
C.白色
D.黄+蓝
[多选题]开门器在实施救援作业时,一般需要其他的器材的配合。主要有:____( )______等。
A.固定带
B.橡胶锤
C.撬棍
D.组合破拆器
[多选题]泪器包括( )
A.泪点
B.泪腺
C.泪囊
D.泪小管
E.鼻泪管
[单项选择]气化炉高压保护氮气的作用是保护()。
A. 热电阻
B. 热电偶
C. 气化炉
D. 烧咀
[多项选择]隧道施工监控量测的目的包括( )。
A. 掌握围岩和支护的动态信息并及时反馈,指导施工作业
B. 通过对围岩和支护的变位、应力量测,修改支护系统设计
C. 分析各项量测信息,确认或修正设计参数:
D. 为理论解析、数值分析提供计算依据与对比指标
E. 为地下工程设计与施工积累经验资料
[填空题]东风 11 型机车当机车速度低于 98km/h 时, 解除( )。
[单项选择]患者烦渴多饮,口干舌燥,尿频量多,舌边尖红,苔薄黄,脉洪数,治疗选方为()
A. 消渴方
B. 人参白虎汤
C. 玉女煎
D. 六味地黄丸
E. 生脉饮
[单项选择]______, all the sophomores in colleges and universities must take part in the College English Test.
A. Beginning that year
B. Beginning on that year
C. Beginning in that year
D. Beginning that year on
[填空题] 双层集装箱径路上的接触网导线高度小于等于()mm的低净空桥下严禁工务线路擅自抬道。
[单选题]《道岔保养质量评定标准》规定:道岔两尖轨尖端相错量大于20mm、无缝道岔位移超过10mm,每个扣( )分。
A.4
B.8
C.16
D.41
[简答题]《中国铁路上海局集团有限公司旅客投诉处理实施细则》的通知(上铁客〔2018〕179号)中规定,旅客投诉处理应遵循“<--NRC-->、统一受理、依法合规、专业管理、客观公正、注重实效”的原则。
[判断题]安全生产法》关于从业员的安全生产义务主要有4项:即遵章守规,服从管理;佩带和使用劳动防护用品;接受培训,掌握安全生产技能;发现事故隐患及进度报告。
A.正确
B.错误
[多选题]下列需要供电部门配合的作业是( )。
A.更换带有回流线的钢轨
B.整组更换道岔
C.线路起拨道超过标准
D.单根抽换轨枕
[单项选择]急性前葡萄膜炎时,瞳孔会出现何种变化:()
A. 变大
B. 缩小
C. 无变化
D. 以上均正确
[单项选择]在设备监理工作实施中,( )是设备监理工作的核心内容。
A. 合同管理
B. 信息管理
C. 协调
D. 沟通
[填空题]作业人员在距离牵引供电设备不足安全距离的建筑物或构筑物等设施设备上作业或应急处置前,牵引供电设备停电后,必须采取停电、安设接地线等安全防护措施后方可作业。( )或接地线拆除后,严禁再次进入作业点进行任何与牵引供电设备有关的作业或应急处置。
[单项选择] Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation.
When was the Tunnel opened to the public
A. 1990.
B. 1991.
C. 1992.
D. 1993.
[单项选择]健康成年人,其体液总量约为体重的()
A. 60%
B. 55%
C. 50%
D. 45%
E. 40%
[判断题]电磁式堵漏工具用于压力16巴的管道裂缝密封。( )
A.正确
B.错误
[单项选择]南方某放牧牛群部分牛食欲减退,精神不振,腹泻,血便,严重贫血,衰竭死亡。剖检见肝脏肿大,有多量虫卵结节。该病最可能的病原是()
A. 肝片形吸虫
B. 大片形吸虫
C. 腔阔盘吸虫
D. 矛形歧腔吸虫
E. 日本分体吸虫
[单项选择]制动器通常是利用摩擦来产生制动作用的,制动器的结构主要分为哪种()
A. 鼓式
B. 盘式和鼓式
C. 盘式
[判断题]减压塔塔底吹汽的目的是为了降低汽化段的油气分压。
A.正确
B.错误
[单选题]1884年在上海妇孺医院推行“南丁格尔护理制度”的是
A.英国传教士巴克尔
B.美籍约翰逊女士
C.美国护理学者莉迪亚・海尔
D.美国护士麦克奇尼
E.中国钟茂芳
[单选题]严禁带负荷进行( )倒闸作业。
A.隔离开关
B.断路器
C.负荷开关
[简答题]
In our increasingly complex world, information is becoming the basic building block of the society. (46) However, at a time when the acquisition of new scientific information alone is approaching a rate of 250 million pages annually, the tide of knowledge is. overwhelming the human capability of dealing with it. So man must turn to a machine if he hopes to contain the tide and channel it to beneficial ends.
(47) The electronic computer, handling millions of facts with the swiftness of light, has given contemporary meaning to Aristotle’s vision of the liberating possibilities of machines: "When looms weave by themselves, man’s slavery will end." By transforming the way in which he gathers, stores, retrieves, and uses information, this versatile instrument is helping man to overcome his mental and physical limitations. (48) It is vastly widening his intellectual horizon, enabling him better to comprehend his universe, and providing the
[单选题]道岔起拨改作业,应在( )点内进行,处理由轨向引起晃车的临时补修应申请“临 时天窗”作业。
A.临时天窗
B.垂直天窗
C.施工天窗
D.维修天窗
[单选题]病人,男性,65岁,患帕金森病3年,其护理措施不正确的是( )
A.鼓励病人自己进食
B.为病人配备手杖
C.将病人用物置于伸手可及处
D.用玻璃杯喝水
E.卫生间安装扶手
[单项选择]()又称为层析法、色谱法或层离法。
A. 萃取法
B. 蒸馏法
C. 色层分析法
D. 分馏法
[单选题] QJ-5和QJ-5B型气动小绞车的最大起重量为( )。
A.9.8 kN
B.14.7 kN
C.20 kN
D.50 kN
[单项选择]美托洛尔()。
A. 血管扩张剂
B. 血管紧张素转换酶抑制剂
C. β受体激动剂
D. 醛固酮拮抗剂
E. β受体阻滞剂