[单选题]业务系统（）前，应备份业务系统软件和配置文件。
A.升级或备份
B.升级或配置更改
C.备份或性能优化
D.配置变更或性能优化

[不定项选择题]共用题干 Learn About Light

1 Ancient civilizations were amazed by the existence of light for thousands of years?The Greek philoso-
phrrs believed that light was made up of countless,tiny particles that enter the human eye and create what
we call vision.However,Empedocles and a Dutch scientist named Christian Huygens believed that light wag
like a wave.According to them,light spread out and travelled like a straight line.This theory was accepted
during the 19th century.
2 In 1905,Albert Einstein published a research paper in which he explained what is referred to as the
photoelectric effect.This theory explains that particles make up light.The particles Einstein was referring to
are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree
that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to
see things around us.
3 Things that give off light are known as sources of light.During the day,the primary source of light is
the sun.Other sources of light include stars,flames,flashllights,street lamps and glowing gases in glass
tube.
4 When we draw the way light travels we always use straight lines.This is because normally light rays
travel in a straight line.However,there are some instances that can change the path and even the nature of
light. They are reflection,absorption,interference（干扰）,etc.
5 Physicists have attempted to measure the speed of light since the early times.In 1849,Hippolyte
Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed
a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,
number of wheel'S teeth and distance of the mirror,he was able to calculate that the speed of light is 313
million meters per second.In a vacuum（真空）,however,the speed of light is 299,792,458 meters per
second.This is about a million times faster than the speed of an airplane. Hippolyte Fizeau conducted an experiment to measure_________.
A.sources of light
B.the speed of light
C.the path of light
D.a straight line
E.a beam of light
F.a form of energy

[判断题]机动车行车制动性能和应急制动性能检验应在平坦,硬实,清洁,干燥.
轮胎与地面间的附着系数不小于 0.7 的水泥或沥青路面上进行。 ()
A.正确
B.错误

[单选题]继电保护回路编号用()位及以下的数字组成。
A.2
B.3
C.4

[单选题]普通平键联接在选定尺寸后，主要是验算其()
A.挤压强度
B.剪切强度
C.弯曲强度
D.耐磨性

[单项选择]"十二经之海"是指
A. 督脉
B. 任脉
C. 冲脉
D. 带脉
E. 阴维脉

[判断题]变压器台架的木杆打帮桩时，相邻两杆不得同时挖坑。
A.正确
B.错误

[单项选择]以下哪位哲学家真正做到了将感性知识与理性知识相结合？（）
A. 培根
B. 伏尔泰
C. 笛卡尔
D. 康德

[单项选择]下列关于划拨建设用地使用权的表述，不正确的是（）。
A. 划拨土地使用权包括土地使用者缴纳拆迁安置、补偿费用和无偿取得（如国有的荒山、沙漠、滩涂等）两种形式
B. 除法律、法规另有规定外，划拨土地没有使用期限的限制，但未经许可不得进行转让、出租、抵押等经营活动
C. 取得划拨土地使用权，必须经有批准权的人民政府核准并按法定的程序办理手续
D. 在国家没有法律规定之前，在城市范围内的土地和城市范围以外的国有土地，均按划拨土地进行管理

[单项选择]增生性肌炎与横纹肌肉瘤的区分主要依据是（）
A. 细胞增生活跃和多形性
B. 肿瘤生长迅速并见核分裂象
C. 见横纹肌母细胞样的细胞
D. 在疏松的黏液样基质内见多形性细胞分布
E. 病变侵犯肌间质，无病理性核分裂象

[判断题]( )高处作业要与架空的电线保持规定的安全距离,以防止触电。
A.正确
B.错误

[单项选择]矿山救护队至服务矿井的距离以行车时间不超过（）分钟为限。
A. 30
B. 45
C. 35
D. 40

[单选题]赵某与某公司签订了劳动合同，该公司为其提供专项培训费用进行专业技术培训，赵某取得电焊工特种作业资格证。该公司由于转产进行裁 员，与赵某解除了劳动合同。依据《劳动合同法》的规定，下列关于赵某与该公司权利义务的说法，正确的是（）。
A.赵某应向该公司返还为其支付的专业技术培训
B.该公司在解除与赵某的劳动合同前，应组织对赵某进行离岗前职业健康检查
C.赵某离职后3年内不得到与该公司从事同类业务的有竞争关系的其他用人单位就业
D.该公司可以直接单方解除与赵某的劳动合同

[单选题]0°探头在实际探伤中钢轨轨腰投影范围内无裂纹时,探头发射的超声波在( )上产生反射。
A.轨腰
B.轨底
C.轨头
D.螺孔

[多选题]在做压缩机油路系统润滑油低报警和油泵自启动试验中，当润滑油压力降到设定值时，需确认( )。
A.备用泵自启动
B.主控润滑油低压力报警准确
C.主控调速油压力低报准确
D.备泵自启动后润滑油压力是否正常

[填空题]Why does cream go bad faster than butter Some researchers think that it comes down to the structure of the food, not its chemical{{U}} (36) {{/U}}--a finding that could help rid some processed foods of chemical preservatives. Cream and butter contain much the same{{U}} (37) {{/U}}, so why cream should sour much faster has been a{{U}} (38) {{/U}}. Both are emulsions--tiny globules of one liquid evenly{{U}} (39) {{/U}}throughout another. The difference lies in what’s in the globules and what’s in the surrounding. In cream, fatty globules drift about in a sea of water. In butter, globules of a watery{{U}} (40) {{/U}}are locked away in a sea of fat. The bacteria which make the food go bad prefer to live in the watery regions of the{{U}} (41) {{/U}}. This means that in cream, the bacteria are free to grow throughout the mixture. When the situation is{{U}} (42) {{/U}}, the bacteria are locked away in{{U}} (43) {{/U}}buried deep in the sea of fat.{{U}} (44) {{/U}}. They

[判断题]《工伤保险条例》规定：职工在工作时间和工作岗位，突发疾病死亡或者在24小时之内经抢救无效死亡的，视同工伤。
A.正确
B.错误

[判断题]韶山型电力机车轮轨润滑装置的作用是减少轮缘、钢轨磨耗，延长车轮和钢轨的使用寿命。（ ）
A.正确
B.错误

[填空题]每台机车上设置两个高压隔离开关，将（）与主回路连通或断开。

[多选题] 与2015年版第五套人民币50元、20元、10元纸币相比,2019年版第五套人民币50元、20元、10元纸币主要取消了()等防伪特征。( )
A. 手感线图案
B. 隐形图案
C. 竖号码
D. 全息磁性开窗安全线
E. 防复印标记

[单项选择]高校老师李某带着孩子去本校校办企业家家乐超市买东西，5岁的孩子手里拿了一包2元钱的糖果，李某没有注意，付完款之后，刚走出超市门，被超市保安抓了个“人赃俱获”。超市保安将学校保安部门的工作人员叫到现场证明，超市保安人员说，“我们超市规定，5元以下商品未交款拿走者罚1000元。”李某没办法就当着学校保安部门的面交了1000元。李某对超市行为不服到工商局投诉。工商局工作人员认为该案属于治安案件，让李某去公安机关申诉。根据行政法基本原理，以下选项哪个是错误的( )
A. 家家乐“超市”不具有行政主体资格，因为它没有也不能得到法律、法规授权，即使它是高校的校办企业也不是国家事业单位的组成部分，即使高校也只是在做出有关学生升学、处分等行为是有部分的行政权力
B. “超市”的合法有效的店堂告示必须在明显的地方张贴，比如将要过期的产品降价处理等是有效的，而家家乐“超市”制定的“罚款规定”是侵犯顾客权益的非法规定，属于无效的店堂告示，没有约束力和强制力
C. 高校的保安人员虽被委托了一部分处罚权力，但是只是针对高校学生的小偷小摸行为、踩踏草地的行为规定二十元以下的罚款，“超市”保安人员没有被委托这些权力，因此，任意的罚款行为属于民事侵权行为
D. 工商行政管理部门的说法是正确的。因为，该案属于治安管理处罚行为，应该由公安机关调查，也可以诉讼到法院解决

[单选题]()用具是登高作业时必须必备的保护用具。( )
A.登高板
B.安全带
C.脚扣

[单选题]在TCP/IP协议栈中，ARP协议的作用是（请作答此空）,RARP协议的作用是（）。
A.从MAC地址查找对应的IP地址
B.有IP地址查找对应的MAC地址
C.把全局IP地址转换为私网中的专用IP地址
D.用于动态分配IP地址

[单项选择]工程规模较小、技术不太复杂、工期较短，且签订合同时已具备详细的设计文件的建设项目应选用的合同计价方式是( )。
A. 固定总价合同
B. 可调总价合同
C. 估计工程量单价合同
D. 纯单价合同

[判断题]一旦发生有限空间作业事故，任何情况下都要以救人为第一要务，现场人员必须第一时间组织实施救援。
A.正确
B.错误

[单选题]58.机车喷机油的原因有：（ ）。
A.A.柴油机供油萤过大
B.B.柴油机呼吸口堵塞
C.C.增压器漏油

[简答题]简述学习策略中常用的几种组织策略。

[单选题]机车牵引电机在电阻制动时作为（ ）运行。
A.发电机
B.电动机
C.直流电机

[单选题]能对自己的化学学习过程进行计划、反思、评价和调控，提高自主学习化学的能力属于高中化学课程的（　　）目标。
A.过程与方法
B.知识与技能
C.知识与能力
D.情感态度与价值观

[多项选择]泻下药具有的功效是
A. 泻下通便
B. 逐水退肿
C. 清热解毒
D. 清热泻火
E. 利水渗湿

[单选题] SCV 水浴温度达到()度方可允许进入 LNG。
A. 10
B. 15
C. 20
D. 25

[单项选择]

Leisure sickness is one of those modem conditions. How do you know if you have been struck down with leisure sickness Were you struck down by some mystery illness just before setting off on a two-week holiday If it is really the case, chances are you have leisure sickness. A Dutch psychologist (荷兰心学家) identified the condition. He started researching the subject after he became curious about his own pattern of illness. "If I am ill, then it’s at the weekend or at Christmas. Then I heard stories from friends who all said the same thing." He surveyed around 2 000 men and women and estimated that about 3% of the population may suffer from weekend or vacation sickness.
In a further in-depth study of 114 Dutch sufferers, he found that the most frequently reported symptoms included headaches, fatigue, muscular (肌肉) pain and, particularly in relation to vacation. Most of them had been suffering from leisure sickness for over 10 years and associated the beg
A. soon after you got your first baby
B. soon after you come back from a vacation
C. if you've been married for years
D. if you've been looking for a job for years