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[单选题]保护零线(  )线与设备连接的要求为(  )。
A.与手持工具连接时,必须采用不小于1.5mm2的铜芯软线
B.与其他机具设备连接时,必须采用不小于2.5mm2的铜芯软线
C.PE线上严禁安装开关,但必须安装熔断线
D.PE线在电源中性点必须与工作零线(N线)相连接
E.PE线与设备连接后,该设备必须进行重复接地

热门试题:

[判断题]业扩负责人应做好现场协调工作。
A.正确
B.错误
[单项选择]在软件生命周期中,能准确地确定软件系统必须做什么和必须具备哪些功能的阶段是______。
A. 概要设计
B. 详细设计
C. 可行性分析
D. 需求分析
[单项选择]( )是招标文件的重要组成部分,是指导投标人如何进行投标的重要文件。
A. 招标公告
B. 通用条款
C. 专用条款
D. 投标人须知
[单选题]银行通过电子渠道非面对面为个人开立( )类账户时,应当要求开户申请人登记验证的手机号码与绑定账户使用的手机号码保持一致。
A.I类账户
B.II类账户
C.III类账户
D.II.III类账户
[单选题]滑轮、棘轮补偿装置a值、b值的警示值为标准值±( )mm。
A.100
B.200
C.300
D.500
[简答题]
Directions: Read the following passage carefully and then translate each underlined part into Chinese.
61. Criticism is a study by which men grow important and formidable at very small expense. The power of invention has been conferred by nature upon few, and the labor of learning those sciences which may, by mere labor be obtained, is too great to be willingly endured; but every man can exert such judgment as be has upon the works of others; and he whom nature has made weak, and idleness keeps ignorant, may yet support his vanity by the name of a critic.
62. I hope it will give comfort to great numbers who are passing through the world in obscurity, when I inform them how easily distinction may be obtained. All the other powers of literature are coy and haughty; they must be long courted and at last are not always gained; but Criticism is a goddess easy of access and forward of advance, who will meet the slow and encourage the
[判断题] 对接触职业危害的从业人员,煤矿企业应按照国家有关规定组织上岗前、在岗期间和离岗时的职业健康检查和医学随访,并将检查结果如实告知从业人员。职业健康检查费用由从业人员承担。()
A.正确
B.错误
[单项选择]某人在一段时间内获得收入状况如下:①在国有企业工作半年,得工资1万元;②在外企工作一年,得工资3万元;③向某企业参股获得分红收入5千元;④利用业余时间为他人理发收入3千元。下列说法正确的是
A. 按资本取得收入8千元
B. 劳动收43000元
C. 按劳动力价值分配所得收40000元
D. 作为个体劳动者所得收入3000元
[判断题]人员推销、广告、销售促进和公共关系是营销组合的四大要素。()
[单选题]网桥在()实现网络互连,其作用是在LAN之间存储转发帧。(3989)
A.物理层
B.数据链路层
C.网络层
D.传输层
[单项选择]IKEA has a strong and living corporate culture. It has grown step by step, bit by bit, along with our business idea. Our culture and business idea are the cornerstones of our (67) .
They support and (68) each other. Our corporate culture helps us to (69) the spirit and vitality of the early years, and to (70) a feeling of belonging in a large international (71) Our corporate culture is what binds us together.
Our corporate culture is based on shared values -- a simple and (72) lifestyle, a natural way of working and being together, without (73) exaggerated respect and complicated regulations.
The key words are simplicity and humility, thrift (节俭), a sense of responsibility, enthusiasm and flexibility. Perhaps the most important of these is simplicity, as (74) in the unpretentious (谦逊的) way we (75) with each other. There are no status (76) to create barrier
A. favorite
B. familiar
C. federal
D. fellow
[单选题].小儿糖尿病多见于哪一型
A..1型
B..2型
C..3型
D..以上都是
[单项选择]E-mail一般的格式是______。
A. 用户名.域名
B. 用户名-域名
C. 用户名@域名
D. 用户名#域名
[单选题]零件经过( )后,可以改善其切削性能。【一般】
A.回火
B.退火
C.淬火
D.正火
[单项选择]下列不是蒙古族节日的是()
A. 那达慕大会
B. 祭敖包
C. 洗澡节
D. 马奶节
[单选题]突发事件的威胁和危害得到控制或消除后,现场指挥部应视情况降低应急响应等级或终止应急响应,同时采取必要的( ),防止次生、衍生事件的发生.
A.安保措施
B.人员撤离
C.控制措施
D.恢复生产
[单项选择]Languages will continue to diverge. Even if English were to become the universal language, it would still take many different forms. Indeed the same could happen to English as has happened to Chinese: a language of intellectuals which doesn’t vary hugely alongside a large number of variants used by local peoples.
We will continue to teach other languages in some form, and not just for reasons of practicality. Learning a language is good for your mental health; it forces you to understand another cultural and intellectual system. So I hope British education will develop a more rational approach to the foreign languages available to students in line with their political importance. Because so many people believe it’s no longer important to know another language, I fear that time devoted to language teaching in schools may well continue to decline. But you can argue that learning another language well is more taxing than, say, learning to play chess well—it involves sensitivity to a
A. computer can alleviate much drudgery
B. computer is always behind the times
C. computer can’t get the inner meaning of words
D. computer has no sensation
[单项选择]混和或相互接触时,不会产生大量热量而着火、爆炸的是()
A. KMnO4和浓硫酸
B. CCl4和碱金属
C. 硝铵和酸
D. 浓HNO4和胺类
[单选题]、急救时以髋关节为支点,利用上身的重力,垂直将正常成人胸骨压陷()cm。单选
A.1~2
B.3~5
C.5~8
D.以上都不对
[单选题]250、水雾喷头是指在一定的压力作用下,在设定的区域内将水流分解为直径()mm以下的水滴并按设计的洒水形状喷出的喷头。
A.A.0.5
B.B.1
C.C.2
D.D.3
[单项选择] To make your driving experience in the United States safe and enjoyable, our company is providing you with this "Rules of the Road" pamphlet. Please note, however, that this pamphlet does not represent a complete list of the motor vehicle and traffic laws of the various states. Regardless of whether or not a specific law is outlined below, it is your responsibility as the driver to follow all applicable (适合的) motor vehicle and traffic laws. Do Not Drink and Drive! Each state strictly prohibits Driving While Drunk. Wear Seatbelts—It’s the Law! Also, the use of child seats for babies and small children (usually under age 5) is required to stay in all states. Place child seats in the back seat only. Stay to the Right In the United States, motor vehicles are operated on the right hand side of the road. Be extremely careful to stay to the right at all times--especially if you are from a left-hand drive country. Obey the Speed Limit In most states, the maxi
A. provide a full list of traffic laws and regulations in the US
B. help drivers to enjoy safe and pleasant driving in the US
C. tell drivers to avoid dangerous roads in various states
D. show drivers the different road signs in all the states
[多选题]无缝线路的优点有哪些? ( )
A.(A|)增加了行车的平稳性,改善了线路质量。      
B. (B)节省了接头材料。
C. (C)适合高速、重载线路的需要。
D.(D) 延长了线路设备和机车车辆的使用寿命。
E.(E) 减缓了线路变形的累积,减少了维修工作量,降低了维修费用。
[单项选择]By "crisis of comprehension" the author means many students ______.
A. are too much concerned with grades
B. fail to understand the real goal of education
C. lack proper practice in phonic and grammar drills
D. are unable to understand what they read, though they do reasonably well on standardized tests
[单选题]锅炉系统发生不明部位蒸汽泄漏时,( )检查漏点,防止蒸汽烫伤。
A.需做好安全防护后
B.戴好安全帽就可以
C.戴好手套就可以
[单选题]装运电杆、变压器和线盘应绑扎牢固,并用绳索绞紧。水泥杆、线盘的周围应塞牢,防止滚动、移动伤人。
A.正确
B.错误
C.略
D.略
E.略
F.略
[单选题]警冲标的埋设高度以两线较高线路的轨枕面为标准,高于轨枕顶面( )mm。
A.200~250
B.250~300
C.300~350
D.350~400
[判断题]已终结的工作票(含工作任务单)、故障紧急抢修单、现场勘察记录至少应保存2年。( )
A.正确
B.错误
[简答题]谈判销售是指?
[单项选择]当作业场所空气中粉尘浓度低于50mg/m3,应选以下哪种直径的滤膜
A. 40mm
B. 50mm
C. 30mm
D. 70mm
E. 60mm
[不定项选择]

根据以下材料,回答151-152题
某一揽子股票组合与香港恒生指数构成完全对应,其当前市场价值为115万港元,且一个月后可收到6000港元现金红利。此时,市场利率为6%,恒生指数为23000点,3个月后交割的恒指期货为23800点。(恒指期货合约的乘数为50港元,不计复利)。

交易者认为存在期现套利机会,应该先()。
A. 买进该股票组合,同时买进1张恒指期货合约
B. 卖出该股票组合,同时卖出1张恒指期货合约
C. 卖出该股票组合,同时买进1张恒指期货合约
D. 买进该股票组合,同时卖出1张恒指期货合约
[单选题]―年8月,国务院印发《促进大数据发展行动纲要》,强调数据已成为国家( )。
A.基础性战略资源
B.规划性战略资源
C.战略性战略资源
D.民生性战略资源
[单选题]XDD0301A055Z 在电气设备上工作,应采取保证安全的组织措施。下面不属于保证安全的组织措施的是( )。
A.工作票制度;
B.工作许可制度;
C.操作票制度;
D.工作间断转移和终结制度。
[单选题]乙类可燃液体的闪点()。
A.<28°
B.≥28°,<60°
C. >28°,<60°
D. ≥28°,≤60
[简答题]患儿, 18月。以咳嗽5天, 加重1天而就诊。证见咳嗽喘促, 气急鼻煽, 无发热, 虚烦不安, 呼吸困难, 面色苍白, 额汗不温, 四肢厥冷, 口唇紫绀, 右胁下可触及痞块, 舌质紫, 苔薄白, 指纹紫滞。查体:T36.7℃。心率170次/分。听诊可闻及双下肺中细湿啰音, 未闻及干啰音。试就本例患儿,作出中医病、证诊断,病机分析,提出治法、主方,开出处方。
[单项选择]动物机体最基本结构和功能单位是()
A. 细胞
B. 组织
C. 器官
D. 系统
E. 体系
[判断题]通票的有效期从指定乘车日起至有效期最后一日的24时止计算。(部竞赛题)
A.正确
B.错误

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