相关试题
【判断题】
为了防止电气火花,电弧等引燃爆炸物,应选用防爆电气级别和温度组别与环境相适应的防爆电气设备。
【判断题】
在爆炸危险场所,应采用三相四线制,单相三线制方式供电。
【判断题】
电力线路敷设时严禁采用突然剪断导线的办法松线。
【判断题】
使用手持式电动工具应当检查电源开关是否失灵、是否破损、是否牢固、接线是否松动。
【判断题】
漏电开关跳闸后,允许采用分路停电再送电的方式检查线路。
【判断题】
为了有明显区别,并列安装的同型号开关应不同高度,错落有致。
【判断题】
接地线是为了在已停电的设备和线路上意外地出现电压时保证工作人员的重要工具。按规定,接地线必须是截面积25m㎡以上裸铜软线制成。
【判断题】
使用竹梯作业时,梯子放置与地面以50°左右为宜。
【判断题】
特种作业人员必须年满20周岁,且不超过国家法定退休年龄。
【判断题】
用钳表测量电动机空转电流时,不需要档位变换可直接进行测量。
【判断题】
据部分省市统计,农村触电事故要少于城市的触电事故。
【判断题】
从过载角度出发,规定了熔断器的额定电压。
【判断题】
电动式时间继电器的延时时间不受电源电压波动及环境温度变化的影响。
【判断题】
分断电流能力是各类刀开关的主要技术参数之一。
【判断题】
中间继电器实际上是一种动作与释放值可调节的电压继电器。
【判断题】
熔断器的特性,是通过熔体的电压值越高,熔断时间越短。
【判断题】
低压配电屏是按一定的接线方案将有关低压一、二次设备组装起来,每一个主电路方案对应一个或多个辅助方案,从而简化了工程设计。
【判断题】
在高压线路发生火灾时,应采用有相应绝缘等级的绝缘工具,迅速拉开隔离开关切断电源,选择二氧化碳或者干粉灭火器进行灭火。
【判断题】
在带电灭火时,如果用喷雾水枪应将水枪喷嘴接地,并穿上绝缘靴和戴上绝缘手套,才可进行灭火操作。
【判断题】
对电机轴承润滑的检查,可通电转动电动机转轴,看是否转动灵活,听有无异声。
【判断题】
在电压低于额定值的一定比例后能自动断电的称为欠压保护。
【判断题】
对于异步电动机,国家标准规定3kw以下的电动机均采用三角形联结。
【判断题】
交流电动机铭牌上的频率是此电机使用的交流电源的频率。
【判断题】
电机异常发响发热的同时,转速急速下降,应立即切断电源,停机检查。
【判断题】
交流发电机是应用电磁感应的原理发电的。
【判断题】
电动机按铭牌数值工作时,短时运行的定额工作制用s2表示。
【判断题】
异步电动机的转差率是旋转磁场的转速与电动机转速之差与旋转磁场的转速之比。
【判断题】
规定小磁针的北极所指的方向是磁力线的方向。
【判断题】
雷电按其传播方式可分为直击雷和感应雷两种。
【判断题】
根据用电性质,电力线路可分为动力线路和配电线路。
推荐试题
【多选题】
党的十九大报告提出，夺取反腐败斗争压倒性胜利，要坚持___，坚持重遏制、强高压、长震慑，坚持受贿行贿一起查，坚决防止党内形成利益集团。
A. 无禁区
B. 全覆盖
C. 零容忍
D. 广覆盖
【多选题】
党对统一战线的领导主要是政治领导，即___的领导，主要体现为党委领导不是部门领导、集体领导而不是个人领导。
A. 政治原则
B. 政治方向
C. 重大方针政策
D. 具体工作
【多选题】
党的纪律主要包括政治纪律、组织纪律、___、工作纪律和生活纪律。
A. 廉洁纪律
B. 干部纪律
C. 作风纪律
D. 群众纪律
【单选题】
The two main islands of the British Isles are .
A. A. Great Britain and Ireland
B. B. Great Britain and Scotland
C. C. Great Britain and Wales
D. D. Great Britain and England
【单选题】
2. is the capital city of Scotland.
A. A. Belfast
B. B. Edinburgh
C. C. Aberdeen
D. D. Cardiff
【单选题】
According to a 2005 estimate, Britain now has a population of over million.
A. A. 160
B. B. 600
C. C. 60
D. D. 16
【单选题】
Among the four parts of the United Kingdom, is the smallest.
A. A. England
B. B. Scotland
C. C. Wales
D. D. Northern Ireland
【单选题】
Almost a quarter of the British population lives in England.
A. A. northeastern
B. B. southeastern
C. C. northwestern
D. D. southwestern
【单选题】
English belongs to the group of Indo-European family of languages.
A. A. Celtic
B. B. Indo-Iranian
C. C. Germanic
D. D. Roman
【单选题】
The introduction of Christianity to Britain added the first element of words to English.
A. A. Danish and Finnish
B. B. Dutch and German
C. C. French and Italian
D. D. Latin and Greek
【单选题】
The evolution of Middle English was reinforced by the influence.
A. A. Norman
B. B. Dutch
C. C. German
D. D. Danish
【单选题】
In Britain, the parliamentary general election is held every years.
A. A. three
B. B. four
C. C. five
D. D. six
【单选题】
has a distinct legal system based on Roman law.
A. A. Wales
B. B. England
C. C. Scotland
D. D. Northern Ireland
【单选题】
Generally speaking, the British Parliament operates on a system.
A. A. single-party
B. B. two-party
C. C. three-party
D. D. multi-party
【单选题】
The policies of the Conservative Party areThe policies of the Conservative Party are characterized by pragmatism and .
A. A. government intervention
B. B. nationalization of enterprises
C. C. social reform
D. D. a belief in individualism
【单选题】
The Labor Party affected the British society greatly in that it .
A. A. set up the National Health Service
B. B. improved public transportation
C. C. abolished the old tax system
D. D. enhanced the economic development
【单选题】
The British economy achieved global dominance by the .
A. A. 1860s
B. B. 1870s
C. C. 1880s
D. D.1890s
【单选题】
In , the British Parliament passed two important acts to establish a welfare state.
A. A. 1945
B. B. 1946
C. C. 1947
D. D. 1948
【单选题】
The in the early 1970s worsened an already stagnant economy in Britain.
A. A. oil crisis
B. B. high inflation rates
C. C. large imports
D. D. unemployment problem
【单选题】
Of the following practices, does not belong to Thatcher’s social welfare reform.
A. A. reducing child benefits
B. B. shortening the unemployment benefits period
C. C. reducing the unemployment
D. D. lowering old age pensions
【单选题】
The Blair government has been successful in all the following aspects except .
A. A. limiting government spending
B. B. keeping inflation under control
C. C. reducing unemployment
D. D. reducing inequality
【单选题】
Britain has devoted of its land area to agriculture.
A. A. 54%
B. B. 64%
C. C. 74%
D. D.84%
【单选题】
Britain’s important fishing areas include all the following except .
A. A. the North Sea
B. B. the English Channelnnel
C. C. The sea area around Ireland
D. D. The sea area between Britain and Ireland
【单选题】
Coal mining industry in Britain provides of the energy consumed in the country.
A. A. 1/3
B. B. 1/4
C. C. 1/5
D. D. 2/3
【单选题】
The car industry in Britain in mostly .
A. A. foreign-owned
B. B. state-owned
C. C. joint-venture
D. D. privately-owned
【单选题】
Of the following sectors in Britain, has experienced spectacular growth since the end of Word War II.
A. A. agriculture
B. B. energy industry
C. C. service industry
D. D. manufacturing industry
【单选题】
Samuel Johnson’s dictionary was influential in establishing a standard form of .
A. A. grammar
B. B. handwriting
C. C. spelling
D. D. pronunciation
【单选题】
At present, nearly of the world’s population communicate in English.
A. A. half
B. B. a quarter
C. C. one third
D. D. one fifth
【单选题】
The attack on Rome ended the Roman occupation in Britain in 410.
A. A. Norman
B. B. Danish
C. C. Celtic
D. D. Germanic
【单选题】
By the late 7th century, became the dominant religion in England.
A. A. Celtic Christianity
B. B. Anglo-Saxon Christianity
C. C. Germanic Christianity
D. D. Roman Christianity
【单选题】
Westminster Abbey was built at the time of .
A. A. St. Augustine
B. B. Edward the Confessor
C. C. William the Conqueror
D. D. Alfred the Great
【单选题】
The marked the establishment of feudalism in England.
A. A. Viking invasion
B. B. signing of the Magna Carta
C. C. Norman Conquest
D. D. Adoption of common law
【单选题】
The end of the Wars of the Roses led to the rule of .
A. A. the House of Valois
B. B. the House of York
C. C. the House of Tudor
D. D. the House of Lancaster
【单选题】
The direct cause for the Religious Reformation was King Henry VIII’s effort to .
A. A. divorce his wife
B. B. break with Rome
C. C. support the Protestants
D. D. declare his supreme power over the church
【单选题】
The English Civil War broke out in 1642 between .
A. A. Protestants and Puritans
B. B. Royalists and Parliamentarians
C. C. nobles and peasants
D. D. aristocrats and Christians
【单选题】
was passed after the Glorious Revolution.
A. A. Bill of Rights
B. B. Act of Supremacy
C. C. Provisions of Oxford
D. D. Magna Carta
【单选题】
The Industrial Revolution was aThe Industrial Revolution was accomplished in Britain by the middle of the century.
A. A. 17th
B. B. 18th
C. C. 19th
D. D. 20th
【单选题】
Britain faced strong challenges in its global imperial dominance by the beginning of the century.
A. A. 17th
B. B. 18th
C. C. 19th
D. D. 20th
【单选题】
As a revising chamber, the House of Lords is expected to the House of Commons.
A. A. rival
B. B. complement
C. C. criticize
D. D. inspect
【单选题】
The British government is characterized by a division of powers between three of the following branches with the exception of the .
A. A. judiciary
B. B. legislature
C. C. monarchy
D. D. executive
