【单选题】
量变的复杂性是指___
A. 量变的程度发展不同
B. 量变形式的多样性和总的量变过程中有部分质变
C. 质变中有量的扩张
D. 量变有在度的范围内的变化和突破度的范围的变化
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【单选题】
量变中的阶段性部分质变表现了___
A. 事物内部各部分之间变化的不平衡性
B. 事物整体与某些构成部分之间变化的不平衡性
C. 事物与事物之间变化的不平衡性
D. 事物的本质属性与非本质属性之间变化的不平衡性
【单选题】
量变中的局部性部分质变是___
A. 事物的本质属性与非本质属性之间变化不平衡性的表现
B. 事物的各个部分之间变化不平衡性的表现
C. 事物的内部矛盾和外部条件变化不平衡性的表现
D. 事物的量和质变化不平衡性的表现
【单选题】
揭示事物发展的趋势和道路的规律是___
A. 对立统一规律
B. 质量互变规律
C. 否定之否定规律
D. 联系和发展规律
【单选题】
“肯定和否定相互渗透,在一定意义上,肯定就是否定。”这是一种___
A. 相对主义诡辩论的观点
B. 唯物辩证法的观点
C. 主观唯心主义的观点
D. 形而上学的观点
【单选题】
事物的否定方面是指___
A. 事物的积极方面
B. 事物的消极方面
C. 事物中维持其存在的方面
D. 事物中促使其灭亡的方面
【单选题】
作为辩证的否定的“扬弃”是___
A. 既保留又继承
B. 彻底抛弃
C. 既克服又保留
D. 矛盾的调和
【单选题】
辩证的否定是事物发展的环节,因为辩证的否定___
A. 把旧事物完全抛弃
B. 使旧事物发生量变
C. 是新事物产生、旧事物灭亡
D. 是从外部强加给事物的
【单选题】
否定之否定规律___
A. 在事物完成一个发展周期时才能完整地表现出来
B. 在事物发展过程中任何一点上都可以表现出来
C. 在事物经过量变和质变两种状态后表现出来
D. 在事物发展过程中经过肯定和否定两个阶段表现出来
【单选题】
事物发展的周期性体现了___
A. 事物发展的直线性与曲折性的统一
B. 事物发展是一个不断地回到出发点的运动
C. 事物发展的周而复始的循环性
D. 事物发展的前进性和曲折性的统一
【单选题】
直线论的错误在于只看到___
A. 事物发展的周期性而否认了前进性
B. 事物发展的前进性而否认了曲折性
C. 事物发展的间接性而否认了连续性
D. 事物发展的曲折性而否认了周期性
【单选题】
循环论的错误在于___
A. 只看到事物发展的普遍性,没有看到事物发展过程的特殊性
B. 只看到事物的绝对运动,没有看到事物的相对静止
C. 只看到事物发展道路的曲折性,没有看到事物发展趋势的前进性
D. 只看到新旧事物之间的连续性,没有看到新旧事物之间的间断性
【单选题】
对立统一规律揭示了___
A. 事物发展的动力和源泉
B. 事物发展的状态和过程
C. 事物发展的方向和道路
D. 事物发展的两种趋向
【单选题】
唯物辩证法的实质和核心是___
A. 对立统一规律
B. 质量互变规律
C. 否定之否定规律
D. 联系和发展的规律
【单选题】
辩证法所说的矛盾是指___
A. 人们思维中的前后不一的自相矛盾
B. 事物之间或事物内部各要素之间的对立统一
C. 对立面之间的相互排斥
D. 事物之间或事物内部各要素之间的相互依赖
【单选题】
矛盾的基本属性是___
A. 普遍性和特殊性
B. 绝对性和相对性
C. 变动性和稳定性
D. 斗争性和同一性
【单选题】
依据是___
A. 矛盾的同一性和斗争性辩证关系的原理
B. 矛盾的普遍性和特殊性辩证关系的原理
C. 事物发展的量变和质变辩证关系的原理
D. 事物发展的内因和外因辩证关系的原理
【单选题】
矛盾问题的精髓是___
A. 矛盾的普遍性和特殊性关系的问题
B. 矛盾的同一性和斗争性关系的问题
C. 主要矛盾和次要矛盾关系的问题
D. 矛盾的主要方面和次要方面关系的问题
【单选题】
题的方法都是___
A. 重点论
B. 均衡论
C. 一点论
D. 两点论
【单选题】
“任何个别(无论怎样)都是一般”。这句话的正确含义是___
A. 特殊性就是普遍性
B. 特殊性存在于普遍性之中
C. 普遍性是特殊性的总和
D. 特殊性中包含普遍性
【单选题】
在唯物辩证法看来,水果同苹果、梨、香蕉、桔子等的关系是___
A. 共性和个性的关系
B. 整体和部分的关系
C. 本质和现象的关系
D. 内容和形式的关系
【单选题】
“是就是是,不是就是不是,除此之外都是鬼话。”这是一种___
A. 形而上学的观点
B. 相对主义的观点
C. 唯心主义的观点
D. 辩证法的观点
【单选题】
真象和假象的区别在于___
A. 真象是客观的,假象是主观的
B. 真象表现本质,假象不表现本质
C. 真象深藏于事物内部,假象外露于事物外部
D. 真象从正面直接地表现本质,假象从反面歪曲地表现本质
【单选题】
有的哲学家说,在大风扬起的尘土中,每一粒尘土的运动状况都是纯粹必然的。这是种___
A. 辩证唯物主义决定论的观点
B. 形而上学的机械决定论的观点
C. 唯心主义非决定论的观点
D. 庸俗唯物主义的观点
【单选题】
“或然率”是指___
A. 可能性在质上的一种科学说明和测定
B. 可能性在量上的一种科学说明和测定
C. 必然性的一种科学说明和判定
D. 偶然性的一种科学说明和测定
【单选题】
Economically speaking, are we better off than we were ten years ago? Twenty years ago?
In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which found that average household income rose by 5.2% in 2015. Unfortunately, that conclusion puts too much weight on a useful, but flawed and incomplete, statistic. Among the more significant problems with the Census’s measure are that: 1) it excludes taxes, transfers, and compensation like employer-provided health insurance; and 2) it is based on surveys rather than data. Even if precisely measured, income data exclude important determinants of economic well-being, such as the hours of work needed to earn that income.
While thinking about the question, we came across a recently published article by Charles Jones and Peter Klenow, which proposes an interesting new measure of economic welfare. While by no means perfect, it is considerably more comprehensive than average income, taking into account not only growth in consumption per person but also changes in working time, life expectancy, and inequality. Moreover, it can be used to assess economic performance both across countries and over time.
The Jones-Klenow method can be illustrated by a cross-country example. Suppose we want to compare the economic welfare of citizens of the U.S. and France in 2005.
In 2005, as the authors observe, real consumption per person in France was only 60% as high as the U.S., making it appear that Americans were economically much better off than the French on average. However, that comparison omits other relevant factors: leisure time, life expectancy, and economic inequality. The French take longer vacations and retire earlier, so typically work fewer hours; they enjoy a higher life expectancy, presumably reflecting advantages with respect to health care, diet, lifestyle, and the like; and income and consumption are somewhat more equally distributed there than in the U.S. Because of these differences, comparing France’s consumption with the U.S.’s overstates the gap in economic welfare.
Similar calculations can be used to compare the U.S. and other countries. For example, this calculation puts economic welfare in the United Kingdom at 97% of U.S. levels, but estimates Mexican well-being at 22%.
The Jones-Klenow measure can also assess an economy’s performance over time. According to this measure, as of the early-to-mid-2000s, the U.S. had the highest economic welfare of any large country. Since 2007, economic welfare in the U.S. has continued to improve. However, the pace of improvement has slowed markedly.
Methodologically, the lesson from the Jones-Klenow research is that economic welfare is multi-dimensional. Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.
What does the author think of the 2015 report by the Census Bureau?___
A. It is based on questionable statistics.
B. It reflects the economic changes.
C. It evidences the improved welfare.
D. It provides much food for thought.
【单选题】
Economically speaking, are we better off than we were ten years ago? Twenty years ago?
In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which found that average household income rose by 5.2% in 2015. Unfortunately, that conclusion puts too much weight on a useful, but flawed and incomplete, statistic. Among the more significant problems with the Census’s measure are that: 1) it excludes taxes, transfers, and compensation like employer-provided health insurance; and 2) it is based on surveys rather than data. Even if precisely measured, income data exclude important determinants of economic well-being, such as the hours of work needed to earn that income.
While thinking about the question, we came across a recently published article by Charles Jones and Peter Klenow, which proposes an interesting new measure of economic welfare. While by no means perfect, it is considerably more comprehensive than average income, taking into account not only growth in consumption per person but also changes in working time, life expectancy, and inequality. Moreover, it can be used to assess economic performance both across countries and over time.
The Jones-Klenow method can be illustrated by a cross-country example. Suppose we want to compare the economic welfare of citizens of the U.S. and France in 2005.
In 2005, as the authors observe, real consumption per person in France was only 60% as high as the U.S., making it appear that Americans were economically much better off than the French on average. However, that comparison omits other relevant factors: leisure time, life expectancy, and economic inequality. The French take longer vacations and retire earlier, so typically work fewer hours; they enjoy a higher life expectancy, presumably reflecting advantages with respect to health care, diet, lifestyle, and the like; and income and consumption are somewhat more equally distributed there than in the U.S. Because of these differences, comparing France’s consumption with the U.S.’s overstates the gap in economic welfare.
Similar calculations can be used to compare the U.S. and other countries. For example, this calculation puts economic welfare in the United Kingdom at 97% of U.S. levels, but estimates Mexican well-being at 22%.
The Jones-Klenow measure can also assess an economy’s performance over time. According to this measure, as of the early-to-mid-2000s, the U.S. had the highest economic welfare of any large country. Since 2007, economic welfare in the U.S. has continued to improve. However, the pace of improvement has slowed markedly.
Methodologically, the lesson from the Jones-Klenow research is that economic welfare is multi-dimensional. Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.
What does the author say about the Jones-Klenow method?___
A. It is widely used to compare the economic growth across countries.
B. It revolutionizes the way of measuring ordinary people’s livelihood.
C. It focuses on people’s consumption rather that their average income.
D. It is a more comprehensive measure of people’s economic well-being.
【单选题】
Economically speaking, are we better off than we were ten years ago? Twenty years ago?
In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which found that average household income rose by 5.2% in 2015. Unfortunately, that conclusion puts too much weight on a useful, but flawed and incomplete, statistic. Among the more significant problems with the Census’s measure are that: 1) it excludes taxes, transfers, and compensation like employer-provided health insurance; and 2) it is based on surveys rather than data. Even if precisely measured, income data exclude important determinants of economic well-being, such as the hours of work needed to earn that income.
While thinking about the question, we came across a recently published article by Charles Jones and Peter Klenow, which proposes an interesting new measure of economic welfare. While by no means perfect, it is considerably more comprehensive than average income, taking into account not only growth in consumption per person but also changes in working time, life expectancy, and inequality. Moreover, it can be used to assess economic performance both across countries and over time.
The Jones-Klenow method can be illustrated by a cross-country example. Suppose we want to compare the economic welfare of citizens of the U.S. and France in 2005.
In 2005, as the authors observe, real consumption per person in France was only 60% as high as the U.S., making it appear that Americans were economically much better off than the French on average. However, that comparison omits other relevant factors: leisure time, life expectancy, and economic inequality. The French take longer vacations and retire earlier, so typically work fewer hours; they enjoy a higher life expectancy, presumably reflecting advantages with respect to health care, diet, lifestyle, and the like; and income and consumption are somewhat more equally distributed there than in the U.S. Because of these differences, comparing France’s consumption with the U.S.’s overstates the gap in economic welfare.
Similar calculations can be used to compare the U.S. and other countries. For example, this calculation puts economic welfare in the United Kingdom at 97% of U.S. levels, but estimates Mexican well-being at 22%.
The Jones-Klenow measure can also assess an economy’s performance over time. According to this measure, as of the early-to-mid-2000s, the U.S. had the highest economic welfare of any large country. Since 2007, economic welfare in the U.S. has continued to improve. However, the pace of improvement has slowed markedly.
Methodologically, the lesson from the Jones-Klenow research is that economic welfare is multi-dimensional. Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.
What do Jones and Klenow think of the comparison between France and the U.S. in terms of real consumption per person?___
A. It reflected the existing big gap between the two economies.
B. It neglected many important indicators of people’s welfare.
C. It covered up the differences between individual citizens.
D. It failed to count in their difference in natural resources.
【单选题】
Economically speaking, are we better off than we were ten years ago? Twenty years ago?
In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which found that average household income rose by 5.2% in 2015. Unfortunately, that conclusion puts too much weight on a useful, but flawed and incomplete, statistic. Among the more significant problems with the Census’s measure are that: 1) it excludes taxes, transfers, and compensation like employer-provided health insurance; and 2) it is based on surveys rather than data. Even if precisely measured, income data exclude important determinants of economic well-being, such as the hours of work needed to earn that income.
While thinking about the question, we came across a recently published article by Charles Jones and Peter Klenow, which proposes an interesting new measure of economic welfare. While by no means perfect, it is considerably more comprehensive than average income, taking into account not only growth in consumption per person but also changes in working time, life expectancy, and inequality. Moreover, it can be used to assess economic performance both across countries and over time.
The Jones-Klenow method can be illustrated by a cross-country example. Suppose we want to compare the economic welfare of citizens of the U.S. and France in 2005.
In 2005, as the authors observe, real consumption per person in France was only 60% as high as the U.S., making it appear that Americans were economically much better off than the French on average. However, that comparison omits other relevant factors: leisure time, life expectancy, and economic inequality. The French take longer vacations and retire earlier, so typically work fewer hours; they enjoy a higher life expectancy, presumably reflecting advantages with respect to health care, diet, lifestyle, and the like; and income and consumption are somewhat more equally distributed there than in the U.S. Because of these differences, comparing France’s consumption with the U.S.’s overstates the gap in economic welfare.
Similar calculations can be used to compare the U.S. and other countries. For example, this calculation puts economic welfare in the United Kingdom at 97% of U.S. levels, but estimates Mexican well-being at 22%.
The Jones-Klenow measure can also assess an economy’s performance over time. According to this measure, as of the early-to-mid-2000s, the U.S. had the highest economic welfare of any large country. Since 2007, economic welfare in the U.S. has continued to improve. However, the pace of improvement has slowed markedly.
Methodologically, the lesson from the Jones-Klenow research is that economic welfare is multi-dimensional. Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.
What is an advantage of the Jones-Klenow method?___
A. It can accurately pinpoint a country’s current economic problems.
B. It can help to raise people’s awareness of their economic well-being.
C. It can diagnose the causes of a country’s slowing pace of economic improvement.
D. It can compare a country’s economic conditions between different periods of time.
【单选题】
Economically speaking, are we better off than we were ten years ago? Twenty years ago?
In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which found that average household income rose by 5.2% in 2015. Unfortunately, that conclusion puts too much weight on a useful, but flawed and incomplete, statistic. Among the more significant problems with the Census’s measure are that: 1) it excludes taxes, transfers, and compensation like employer-provided health insurance; and 2) it is based on surveys rather than data. Even if precisely measured, income data exclude important determinants of economic well-being, such as the hours of work needed to earn that income.
While thinking about the question, we came across a recently published article by Charles Jones and Peter Klenow, which proposes an interesting new measure of economic welfare. While by no means perfect, it is considerably more comprehensive than average income, taking into account not only growth in consumption per person but also changes in working time, life expectancy, and inequality. Moreover, it can be used to assess economic performance both across countries and over time.
The Jones-Klenow method can be illustrated by a cross-country example. Suppose we want to compare the economic welfare of citizens of the U.S. and France in 2005.
In 2005, as the authors observe, real consumption per person in France was only 60% as high as the U.S., making it appear that Americans were economically much better off than the French on average. However, that comparison omits other relevant factors: leisure time, life expectancy, and economic inequality. The French take longer vacations and retire earlier, so typically work fewer hours; they enjoy a higher life expectancy, presumably reflecting advantages with respect to health care, diet, lifestyle, and the like; and income and consumption are somewhat more equally distributed there than in the U.S. Because of these differences, comparing France’s consumption with the U.S.’s overstates the gap in economic welfare.
Similar calculations can be used to compare the U.S. and other countries. For example, this calculation puts economic welfare in the United Kingdom at 97% of U.S. levels, but estimates Mexican well-being at 22%.
The Jones-Klenow measure can also assess an economy’s performance over time. According to this measure, as of the early-to-mid-2000s, the U.S. had the highest economic welfare of any large country. Since 2007, economic welfare in the U.S. has continued to improve. However, the pace of improvement has slowed markedly.
Methodologically, the lesson from the Jones-Klenow research is that economic welfare is multi-dimensional. Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.
What can we infer from the passage about American people’s economic well-being?___
A. It is much better than that of their European counterparts.
B. It has been on the decline ever since the turn of the century.
C. It has not improved as much as reported by the Census Bureau.
D. It has not been accurately assessed and reported since mid-2000s.
【单选题】
大学生的成才目标是___。
A. 培养德智体美全面发展的人才
B. 培养德智体美全面发展的社会主义建设者
C. 培养德智体美全面发展的社会主义建设者和接班人
D. 培养专业化、创新化的人才
【单选题】
世界政治格局发展的必然趋势是___。
A. “多极化”
B. 单边主义
C. 两极格局形成
D. 一超独霸
【单选题】
在全面发展的教育中德、智、体、美是缺一不可,统一存在的,其中处于主导地位的是___。
【单选题】
时代精神的内涵十分丰富,其中___居于核心地位。
A. 艰苦奋斗
B. 自强不息
C. 团结统一
D. 改革创新
【单选题】
民族精神是一个民族赖以生存和发展的精神支撑。中华民族在五千年的发展中所形成的伟大民族精神的核心是___。
A. 爱国主义
B. 人道主义
C. 科学主义
D. 革命英雄主义
【单选题】
下列名言反映中华民族是一个艰苦奋斗的民族的有___。
A. 艰难困苦,玉汝于成
B. 先天下之忧而忧
C. 生于忧患,死于安乐
D. 民无信不立
【单选题】
10。___是我们立党立国的根本指导思想
A. 马克思主义
B. 社会主义荣辱观
C. 社会主义思想道德
D. 爱国主义11. 当代大学生的历史使命是(A)
【单选题】
衡量大学生全面发展的一个重要标准是___
A. 知识渊博
B. 品质高尚
C. 德才兼备
D. 知行统一
推荐试题
【单选题】
若同一平面上三根平行放置的等距导体,流过大小和方向都相同的电流时,则中间导体受到的力为___。
A. 吸力;
B. 斥力;
C. 零;
D. 不变的力。
【单选题】
涡流损耗的大小与频率的___成正比。
A. 大小;
B. 平方值;
C. 立方值;
D. 方根值。
【单选题】
涡流损耗的大小,与铁芯材料的性质___。
A. 有关;
B. 无关;
C. 关系不大;
D. 反比。
【单选题】
消弧线圈在运行时,如果消弧的抽头满足XL=XC的条件时,这种运行方式称___。
A. 过补偿;
B. 欠补偿;
C. 全补偿;
D. 不补偿。
【单选题】
三相全波整流电路在交流一相电压消失时,直流输出电流___。
A. 降至零;
B. 减小;
C. 不变;
D. 增大。
【单选题】
可控硅整流装置是靠改变___来改变输出电压的。
A. 交流电源电压;
B. 输出直流电流;
C. 可控硅触发控制角;
D. 负载大小。
【单选题】
油浸自冷、风冷变压器正常过负荷不应超过___倍的额定值。
A. 1.1;
B. 1.2;
C. 1.3;
D. 1.5。
【单选题】
同样转速的发电机,磁级对数多的,电源频率___。
A. 低;
B. 高;
C. 不变;
D. 不一定。
【单选题】
一台发电机,发出有功功率为80MW、无功功率为60Mvar,它发出的视在功率为___MVA。
A. 120;
B. 117.5;
C. 100;
D. 90。
【单选题】
发电机带纯电阻性负荷运行时,电压与电流的相位差等于___。
A. 180º;
B. 90 º;
C. 0 º;
D. 270 º。
【单选题】
如果发电机的功率因数为迟相,则发电机送出的是___无功功率。
A. 感性的;
B. 容性的;
C. 感性和容性的;
D. 电阻性的。
【单选题】
发电机绕组中流过电流之后,就在绕组的导体内产生损耗而发热,这种损耗称为___。
A. 铁损耗;
B. 铜损耗;
C. 涡流损耗;
D. 杂散损耗。
【单选题】
目前大型汽轮发电机组大多采用内冷方式,冷却介质为___。
A. 水;
B. 氢气和水;
C. 氢气;
D. 水和空气。
【单选题】
发电机励磁电流通过转子绕组和电刷时,产生的激磁损耗,属于___损耗。
A. 电阻;
B. 电抗;
C. 机械;
D. 电感。
【单选题】
发电机在运行中失去励磁后,其运行状态是___。
A. 继续维持同步;
B. 由同步进入异步;
C. 时而同步,时而异步;
D. 发电机振荡。
【单选题】
汽轮发电机的强行励磁电压与额定励磁电压之比叫强行励磁的倍数,对于汽轮发电机应不小于___倍。
A. 1.5;
B. 2;
C. 2.5;
D. 3。
【单选题】
发电机如果在运行中功率因数过高(cosφ=1)会使发电机___。
A. 功角减小;
B. 动态稳定性降低;
C. 静态稳定性降低;
D. 功角增大。
【单选题】
对隐极式汽轮发电机承受不平衡负荷的限制,主要是由转子___决定的。
A. 发热条件;
B. 振动条件;
C. 磁场均匀性;
D. 电流性。
【单选题】
电机定子铁芯常采用导磁率高、损耗小的___片叠压而成。
A. 铁钴合金;
B. 铁镍合金;
C. 硅钢;
D. 超导钢。
【单选题】
确定发电机正常运行时的允许温升与该发电机的冷却方式、___和冷却介质有关。
A. 负荷大小;
B. 工作条件;
C. 绝缘等级;
D. 运行寿命。
【单选题】
发电机组的调速器根据系统中频率的微小变化而进行的调节作用,通常称为___。
A. 一次调节;
B. 二次调节;
C. 三次调节;
D. 四次调节。
【单选题】
作为发电厂的主变压器的接线组别一般采用___。
A. YN,y0;
B. YN,dll;
C. YN,dl;
D. D,d0。
【单选题】
现在普遍使用的变压器呼吸器中的硅胶,正常未吸潮时颜色应为___。
A. 蓝色;
B. 黄色;
C. 白色;
D. 粉红色。
【单选题】
现在普遍使用的变压器呼吸器中的硅胶,吸潮时颜色应为___。
A. 蓝色;
B. 黄色;
C. 白色;
D. 粉红色。
【单选题】
变压器一次侧为额定电压时,其二次侧电压___。
A. 必然为额定值;
B. 随着负载电流的大小和功率因数的高低而变化;
C. 随着所带负载的性质而变化;
D. 无变化规律。
【单选题】
通常把由于___变化而引起发电机组输出功率变化的关系称为调节特性。
A. 频率;
B. 电压;
C. 运行方式;
D. 励磁。
【单选题】
正常情况下,发电机耐受___的额定电压,对定子绕组的绝缘影响不大。
A. 1.3倍;
B. 1.5倍;
C. 1.8倍;
D. 2倍。
【单选题】
变压器泄漏电流测量主要是检查变压器的___。
A. 绕组绝缘是否局部损坏;
B. 绕组损耗大小;
C. 内部是否放电;
D. 绕组绝缘是否受潮。
【单选题】
电除尘器的工作原理是___。
A. 利用烟速降低后,灰的自然沉降作用除尘的;
B. 利用灰的粘结性粘附在收尘板上进行除尘的;
C. 利用高电压产生的场强使气体局部电离,并利用电场力实现粒子与气流的分离;
D. 利用高电压产生的电解作用使粒子与气流的分离。
【单选题】
并联运行的变压器,所谓经济还是不经济,是以变压器的___来衡量的。
A. 运行方式的灵活性;
B. 总损耗的大小;
C. 效率的高低;
D. 供电可靠性。
【单选题】
变压器油的粘度说明油的流动性好坏,温度越高,粘度___。
A. 越小;
B. 越大;
C. 非常大;
D. 不变。
【单选题】
变压器铭牌上的额定容量是指___。
A. 有功功率;
B. 无功功率;
C. 视在功率;
D. 平均功率。
【单选题】
变压器油中的___对油的绝缘强度影响最大。
A. 凝固点;
B. 粘度;
C. 水分;
D. 硬度。
【单选题】
变压器运行时,温度最高的部位是___。
A. 铁芯;
B. 绕组;
C. 上层绝缘油;
D. 下层绝缘油。
【单选题】
变压器套管是引线与___间的绝缘。
A. 高压绕组;
B. 低压绕组;
C. 油箱;
D. 铁芯。
【单选题】
在有载分接开关中,过渡电阻的作用是___。
A. 限制分头间的过电压;
B. 熄弧;
C. 限制切换过程中的循环电流;
D. 限制切换过程中的负载电流。
【单选题】
分裂绕组变压器低压侧的两个分裂绕组,它们各与不分裂的高压绕组之间所具有的短路阻抗___。
A. 相等;
B. 不等;
C. 其中一个应为另一个的2倍;
D. 其中一个应为另一个的3倍。
【单选题】
感应电动机的转速,永远___旋转磁场的转速。
A. 大于;
B. 小于;
C. 等于;
D. 不变。
【单选题】
异步电动机是一种___的设备。
A. 高功率因数;
B. 低功率因数;
C. 功率因数是1;
D. 功率因数是0。
【单选题】
电动机定子电流等于空载电流与负载电流___。
A. 之和;
B. 之差;
C. 之比;
D. 相量之和。