相关试题
【单选题】
使用扳手拧螺母时，应该将螺母放在扳手口的___。
【单选题】
喷灯打气加压时，要检查并确认进油阀可靠地___。
A. 关闭
B. 打开
C. 打开一点
D. 打开或关闭
【单选题】
喷灯使用完毕，应将剩余的燃料油___，将喷灯污物擦除后，妥善保管。
A. 烧净
B. 保存在油筒内
C. 倒掉
D. 倒出回收
【单选题】
千分尺测微螺杆的螺距为___mm，它装入固定套筒的螺孔中。
A. 0.6
B. 0.8
C. 0.5
D. 1
【单选题】
选用量具时，不能用千分尺测量___的表面。
A. 精度一般
B. 精度较高
C. 精度较低
D. 粗糙
【单选题】
测量前需要将千分尺___擦拭干净后，检查零件是否正确。
A. 固定套筒
B. 测量面
C. 微分筒
D. 测微螺杆
【单选题】
裸导线一般用于___。
A. 室内布线
B. 室外架空线
C. 水下布线
D. 高压布线
【单选题】
常用的裸导线有铜绞线、铝绞线和___。
A. 钨丝
B. 焊锡丝
C. 钢丝
D. 钢芯铝绞线humb
【单选题】
绝缘导线是___的导线。
A. 潮湿
B. 干燥
C. 有绝缘包皮
D. 有氧化层
【单选题】
常用的绝缘材料包括气体绝缘材料、___和固体绝缘材料。
A. 木头
B. 玻璃
C. 胶木
D. 液体绝缘材料
【单选题】
各种绝缘材料的___的各种指标是抗张、抗压、抗弯、抗剪、抗撕、抗冲击等各种强度指标。
A. 绝缘电阻
B. 击穿强度
C. 强度
D. 耐热性
【单选题】
各种绝缘材料的机械强度的各种指标是___等各种强度指标。
A. 抗张、抗压、抗弯
B. 抗剪、抗撕、抗冲击
C. 抗张、抗压
D. 含AB两项
【单选题】
绝缘导线多用于___和房屋附近的室外布线。
A. 安全电压布线
B. 架空线
C. 室外布线
D. 室内布线
【单选题】
永磁材料的主要分类有金属永磁材料、___、其他永磁材料。
A. 硅钢片
B. 铝
C. 辆铁
D. 铁氧体永磁材料
【单选题】
软磁材料的主要分类有铁氧体软磁材料___其他软磁材料
A. 不锈钢
B. 铜合金
C. 铝合金
D. 金属软破材料
【单选题】
电磁铁的铁芯应该选用___。
A. 软磁材料
B. 永磁材料
C. 硬磁材料
D. 永久磁铁
【单选题】
异步电动机的铁芯应该选用___
A. 永久磁铁
B. 永磁材料
C. 软磁材料
D. 硬磁材料
【单选题】
常见的电伤包括___。
A. 电弧烧伤
B. 电烙印
C. 皮肤金属化
D. 以上都是
【单选题】
跨步电压触电，触电者的症状是___。
A. 脚发麻
B. 腿发麻、抽筋并伴有跌倒在地
C. 腿发麻
D. 以上都是
【单选题】
人体触电后，会出现___。
A. 神经麻痹
B. 呼吸中断
C. 心脏停止跳动
D. 以上都是
【单选题】
___是人体能感觉有电的最小电流。
A. 感知电流
B. 触电电流
C. 伤害电流
D. 有电电流
【单选题】
___mA的工频电流通过人体时，人体尚可摆脱电流。
【单选题】
如果人体直接接触带电设备及线路的一相时，电流通过人体而发生的触电现象称为___。
A. 单相触电
B. 两相触电
C. 接触电压触电
D. 跨步电压触电
【单选题】
在超高压线路下或设备附近站立或行走的人，往往会感到___。
A. 不舒服、电击
B. 刺痛感、毛发耸立
C. 电伤、精神紧张
D. 电弧烧伤
【单选题】
电击是电流通过人体内部，破坏人的___。
A. 内脏组织
B. 肌肉
C. 关节
D. 脑组织
【单选题】
电伤是指电流的___。
A. 热效应
B. 化学反应
C. 机械效应
D. 以上都是
【单选题】
当人体触及___时，可能导致电击的伤害。
A. 带电导线
B. 漏电设备的外壳和其他带电体
C. 雷击或电容放电
D. 以上都是
【单选题】
17l.如果触电者伤势较重，已失去知觉，但心跳和呼吸还存在，应使___。
A. 触电者舒适，安静地平躺
B. 触电者周围不围人，使空气流通
C. 解开伤者的衣服以利呼吸，并速请医生前来或送往医院
D. 以上都是
【单选题】
当触电伤者伤势严重，心跳停止，应立即进行胸外心脏挤压法进行急教，其频率约为___次/min
【单选题】
高压设备发生接地时，室内不得接近故障点___m以内。
【单选题】
机床照明、移动行灯等设备，使用的安全电压为___V。
【单选题】
凡工作地点狭窄，因工作人员活动困难，周围有大面积接地导体或金属结构存在高度触电危险的环境以及特别潮湿的场所，则使用设备时的安全电压为___V。
【单选题】
电器通电后发现冒烟、发出烧焦气味或着火时，应立即___。
A. 逃离现场
B. 泡沫灭火器灭火
C. 用水灭火
D. 切断电源
【单选题】
电器着火时下列不能用的灭火方法是用___灭火。
A. 四氯化碳
B. 二氧化碳
C. 沙土
D. 水
【单选题】
本安防爆型电路及其外部配线用的电缆或绝缘导线的耐压强度应选用电路额定电压的2倍，最低为___V。
A. 500
B. 400
C. 300
D. 800
【单选题】
非本安防爆型电路及其外部配线用的电缆或绝缘导线的耐压强度最低为___V。
A. 1000
B. 1500
C. 3000
D. 500
推荐试题
【单选题】
Abraham Lincoln issued to grant freedom to all slaves.
A. A. Declaration of Independence
B. B. Constitution
C. C. Emancipation Proclamation
D. D. Bill of Rights
【单选题】
In May 1775, was held in Philadelphia and began to assume the functions of a national government.
A. A. the First Continental Congress
B. B. the Second Continental Congress
C. C. the Boston Tea Party
D. D. the Congress of Confederation
【单选题】
The first shots of the American dependence were fired in .
A. A. Concord
B. B. Lexington
C. C. Philadelphia
D. D. Boston
【单选题】
“No taxation without representation” was the rallying slogan of .
A. A. the settlers of Virginia
B. B. the people of Pennsylvania
C. C. the colonists in New England
D. D. the people of the 13 colonies
【单选题】
The Seven Years’ War occurred between the .
A. A. French and American Indians
B. B. French and Spaniards
C. C. French and British
D. D. British and American Indians
【单选题】
Pilgrim Fathers are a group of who came to America to avoid persecution in England.
A. A. Protestants
B. B. Puritans
C. C. Catholics
D. D. Christians
【单选题】
The first successful English colony in North America was founded at in .
A. A. Jamestown, Louisiana
B. B. Boston, Massachusetts
C. C. Jamestown, Virginia
D. D. Plymouth, Georgia
【单选题】
The characteristic of dominant American culture is .
A. A. English-speaking, northern European, Roman Catholic and middle-class
B. B. English-speaking, western European, Roman Catholic and upper-class
C. C. English-speaking, northern European, Protestant and upper-class
D. D. English-speaking, western European, Protestant and middle-class
【单选题】
The ImmiWar of Ingrants Act of 1924 restricted the further immigration into the United States, particularly from .
A. A. Europe
B. B. Asia
C. C. Africa
D. D. South America
【单选题】
The largest minority in the United States is the .
A. A. Pacific Islanders
B. B. Blacks
C. C. Native Americans
D. D. Asians
【单选题】
The native Alaskan population includes the following except the .
A. A. Indians
B. B. Eskimos
C. C. Aleuts
D. D. Blacks
【单选题】
is located on the U. S. –Canadian border between Lake Erie and Lake Ontario.
A. A. Yellowstone National Park
B. B. The Grand Canyon
C. C. Niagara Falls
D. D. The Great Salt Lake
【单选题】
Some of the world famous universities like Harvard, Yale and MIT are located .
A. A. in the South
B. B. along the Pacific Coast
C. C. in New England
D. D. in the Midwest
【单选题】
The largest river in the U. S. is .
A. A. the Missouri River
B. B. the Mississippi River
C. C. the Ohio River
D. D. the Colorado River
【单选题】
The U. S. lies in North America, with Canada to the north, Mexico to the south, the Atlantic to its and the Pacific to its .
A. A. northern, east, west
B. B. central, east, west
C. C. southern, west, east
D. D. western, east, west
【单选题】
The state of is the largest in area of all the states.
A. A. Alaska
B. B. Hawaii
C. C. Texas
D. D. Florid
【单选题】
The United States has states on the continent.
A. A. 50
B. B. 49
C. C. 48
D. D. 35
【单选题】
Waiting for Godot is written by .
A. A. Samuel Beckett
B. B. George Orwell
C. C. William Golding
D. D. D. H. Lawrence
【单选题】
Of the following writers, is NOT a Nobel Prize winner.
A. A. Samuel Beckett
B. B. James Joyce
C. C. William Golding
D. D. V. S. Naipaul
【单选题】
Of the following statements, is NOT correct about Virginia Woolf.
A. A. She was a central figure of the “Bloomsbury Group”.
B. B. She experimented with stream of consciousness.
C. C. She was an influential feminist.
D. D. Her masterpiece was The Rainbow.
【单选题】
Of the following books, was NOT written by Thomas Hardy.
A. A. Jude the Obscure
B. B. Tess of the D’Urbervilles
C. C. Adam Bede
D. D. The Return of the Native
【单选题】
is NOT included in the modernist group.
A. A. Oscar Wild
B. B. Virginia Woolf
C. C. William Butler Yeats
D. D. T. S. Eliot
【单选题】
Of the following statements, is NOT correct in terms of Neo-Romanticism.
A. A. It prevailed at the end of the 19th century.
B. B. The writers were dissatisfied with the social reality.
C. C. The writers believed in “Art for Art’s Sake”.
D. D. Treasure Island was a representative work.
【单选题】
is a representative of English Critical Realism at the turn of the 19th century.
A. A. Robert Louis Stevenson
B. B. John Milton
C. Joseph Conrad
D. D. Thomas Hardy
【单选题】
Of Dickens’ novels, is considered autobiographical.
A. A. A Tale of Two Cities
B. B. David Copperfield
C. C. Oliver Twist
D. D. Great Expectations
【单选题】
is viewed as Romantic poetry’s “Declaration of Independence.”
A. A. “I Wondered Lonely as a Cloud”
B. B. Don Juan
C. C. “Preface to Lyrical Ballads”
D. D. Prometheus Unbound
【单选题】
The most significant achievement of the English Renaissance is .
A. A. poetry
B. B. drama
C. C. novel
D. D. pamphlet
【单选题】
The following Christmas traditions are particularly British except .
A. A. Trooping the Color
B. B. Queen’s Christmas message
C. C. Boxing Day
D. D. Christmas pantomime
【单选题】
Of the following, is NOT a common feature of all the British holidays.
A. A. families getting together
B. B. friends exchanging good wishes
C. C. friends enjoying each other’s company
D. D. families traveling overseas
【单选题】
is Britain’s top pay television provider.
A. A. BSB
B. B. SkyTV
C. C. BBC
D. D. BSkyB
【单选题】
Life on Earth is a kind of program produced by the BBC and is popular among 500 million viewers worldwide.
A. A. feature
B. B. drama
C. C. documentary
D. D. soap opera
【单选题】
Among Britain’s quality press, the following newspapers are regarded as the “Big Three” with the exception of .
A. A. The Times
B. B. The Guardian
C. C. The Observer
D. D. The Daily Telegraph
【单选题】
To be admitted to the Open University, one need .
A. A. some educational qualifications
B. B. no educational qualifications
C. C. General Certificate of Education-Advanced
D. D. General National Vocational Qualifications
【单选题】
Of the following, is NOT a basis of admission to Britain’s universities.
A. A. result in national entrance test
B. B. A-level result
C. C. an interview
D. D. school references
【单选题】
Partially funded by central government grants, the British univPartially funded by central government grants, the British universities receive their remaining funds from all the following sources except .
A. A. tuition fees
B. B. loans
C. C. donations
D. D. corporate contributions
【单选题】
About of British children receive primary and secondary education through the independent system.
A. A. 5%
B. B. 6%
C. C. 7%
D. D. 8%
【单选题】
In Britain, the division between grammar schools and vocational schools were ended by the introduction of comprehensive schools in the .
A. A. 1930s
B. B. 1940s
C. C. 1950s
D. D. 1960s
【单选题】
马克思主义理论从狭义上说是___
A. 无产阶级争取自身解放和整个人类解放的学说体系
B. 关于无产阶级斗争的性质、目的和解放条件的学说
C. 马克思和恩格斯创立的基本理论、基本观点和基本方法构成的科学体系
D. 关于资本主义转化为社会主义以及社会主义和共产主义发展的普遍规律的学说
【单选题】
马克思主义理论从广义上说是___
A. 不仅指马克思恩格斯创立的基本理论、基本观点和学说的体系，也包括继承者对它的发展。
B. 无产阶级争取自身解放和整个人类解放的学说体系
C. 关于无产阶级斗争的性质、目的和解放条件的学说
D. 马克思和恩格斯创立的基本理论、基本观点和基本方法构成的科学体系
【单选题】
作为中国共产党和社会主义事业指导思想的马克思主义是指___
A. 不仅指马克思恩格斯创立的基本理论、基本观点和学说的体系，也包括继承者对它的发展。
B. 无产阶级争取自身解放和整个人类解放的学说体系
C. 关于无产阶级斗争的性质、目的和解放条件的学说
D. 列宁创立的基本理论、基本观点和基本方法构成的科学体系
