财经类考试拍照搜题-2024欧洲杯竞猜官方平台

每日一练问答 7709

先导通道的形成是以________的出现为特征的。

流注理论未考虑________现象。

________不是发生污闪最危险的气象条件。

极不均匀电场中的极性效应表明________。

在大气条件下,流注理论认为放电发展的维持是靠________。

解释气压较高、距离较长的间隙中的气体放电过程可用________。

________下列哪种介质的逸出功最小。

能够维持稳定电晕放电的电场结构属于________。

pd过大,这时________实验现象无法用汤逊理论给出解释。

电晕放电是一种________。

描述气体间隙放电电压与气压之间关系的是________。

沿着固体介质表面发生的气体放电称为________。

伏秒特性曲线实际上是一条带状区域,因为在冲击电压作用下,间隙放电时间具有________。

能有效提高支持绝缘子沿面闪络电压的措施是________。

第一章作业

在进行绝缘冲击耐压试验时,避雷针的接地电阻________。

在进行冲击电压测量时,对于操作过电压主要使用________。

以下试验项目属于破坏性试验的是________。

电力系统中直击雷防护的主要装置是________。

不能用于测量直流高压的仪器设备是________。

避雷针保护范围通常是指雷击概率为________。

伏秒特性曲线实际上是一条带状区域,因为在冲击电压作用下,间隙放电时间具有________。

下列仪器或测量系统中,不能用来测量冲击电压的是________。

供试验用的标准雷电冲击全波是由________指数函数叠加的。

由于冲击击穿电压有________,一般取50%放电电压。

一般情况下,50%冲击击穿比工频击穿电压的峰值要_______。

一般情况下,极不均匀电场间隙的冲击击穿常常发生在_______。

作业题目见附件文档。

计算时通常应使用分部积分法中的

计算的原函数时通常应使用分部积分法中的

在有理函数的部分分式分解中————————

在有理函数的部分分式分解中————————

,其中————————

,其中————————

在计算三角函数有理式的不定积分中一般使用变换

令, 中___________

令,在中___________

令,在中___________

在型不定积分的计算中中通常可以采用变换

在型不定积分的计算中中通常可以采用变换

下列选项中哪一个的原函数不能用初等函数表示

判断下列计算过程是否正确

闭区间上的有界函数必可积

闭区间上的可积函数必有界

下列函数类哪些是可积函数类

闭区间上有无限多个间断点的函数必不可积

在上可积,在上可积,则在上可积

在上可积,在上可积,则在上可积

在上可积,则在上可积

,则在区间上处处有

在上可积,则存在,使得

、在上均连续,则存在,使得

,则

,则

在上连续,在上单调,则存在,使得

在上连续,在上可积,则存在,使得

以下计算过程是否正确:

以下计算过程是否正确:

计算时通常用分部积分法中的

计算时通常用分部积分法中的

下列叙述正确的是

下列叙述不正确的是

下列叙述哪些是函数在区间上可积的等价条件

下列叙述哪些是函数在区间上可积的等价条件

由曲线以及直线轴围成的平面面积为

由曲线以及直线围成的平面图形面积为

由曲线(其中连续,连续可微且)以及直线 (其中)和轴所围图形的面积为

由极坐标曲线以及射线所围图形的面积为

设连续,是由平面图形绕轴旋转一周所得的旋转体,那么的体积为

设()连续可微,是由平面图形绕轴旋转一周所得的旋转体,那么的体积为

下列公式哪些是弧长的计算公式

下列叙述正确的是

光滑曲线一点处的曲率表示

光滑曲线绕轴旋转一周所得旋转曲面的面积公式是

光滑曲线绕轴旋转一周所得旋转曲面的面积是

在近似计算定积分时抛物线法一定比梯形法更精确

由梯形法求定积分近似值时,当被积函数为凸函数时计算结果偏小

无穷积分收敛,则收敛

若,都收敛,则也收敛

若,都发散,则也发散

,是定义在上的非负函数且,那么有

以下哪些选项是阿贝尔判别法推出无穷积分收敛的条件

以下哪些选项是狄利克雷判别法推出无穷积分收敛的条件

瑕积分(瑕点为)都收敛,则瑕积分(瑕点为)也收敛

瑕积分(瑕点为)收敛,则瑕积分(瑕点为)也收敛

若在内存在原函数,则在内必有

一切初等函数在其定义区间上都有原函数

设且为偶函数,则必为奇函数

函数(为正常数)和是同一函数的原函数

在计算含有项的不定积分时,常用的换元是

在计算含有项的不定积分时,常用的换元是

在计算含有项的不定积分时,常用的换元是

与外界没有物质交换,但有热量或功交换的热力系统是( )。

在环境压力不变情况下,当真空表指示数值愈大时,表明被测对象的实际压力愈大还是愈小?

关于准平衡(静态)过程,下列说法错误的是( )。

可逆过程是( )。

逆向循环用于制冷时,循环的经济性用( )来评价。

某容器被一刚性壁分为两部分,如下图所示。已知当场大气压pb= 0.1 mpa ,压力表b的读数为0.17 mpa ,压力表a 的读数为0.11 mpa 。问容器内ⅱ部分的绝对压力为多少mpa ?

某容器被一刚性壁分为两部分,如下图所示。已知当场大气压pb= 0.1 mpa ,压力表b的读数为0.17 mpa ,压力表a 的读数为0.11 mpa 。试确定容器内ⅰ部分的绝对压力为多少mpa?

以下系统中,( )质量不变。

正向循环是( )的循环。

热力学中关于热量q正负的约定是( )。

状态参数图上有一条连续实线表示的过程,则该过程一定是准平衡过程。

一定量的水,从海洋蒸发变为云,云在高山上变为雨、雪,并凝结成冰。冰、雪熔化变成水流入江河,最后流入大海,一定量的水又回到始态。问历经整个循环,水的热力学能和焓的变化为( )。

若动能和位能可忽略不计,则系统中因引进1 kg工质而获得的总能量等于 ( )。

闭口系统能量方程中,热量正负的约定是( )。

闭口系统能量方程中,关于功的正负,说确的是( )。

气体吸热后一定对外作功。

第一类永动机是不花费任何能量就可以产生动力的机器,第一类永动机是不可能制造成功的。

焓是开口系统中流入(或流出)系统工质所携带的取决于热力学状态的总能量。

热力学第一定律实质上就是能量守恒与转化定律在热现象上的应用。

方程 描述了( )的变化规律

理想气体的数值( )。

满足δq=cvdt pdv 的条件是( )。

理想气体在定容过程中,压力升高时温度( )。

在p-v图上,过程功w大于零的过程位于( )区域。

在t-s图上,技术功 wt >0 的过程位于通过起点的( ) 区域。

在t-s图上,理想气体热力学能增量δu < 0和焓增量δh<0的过程位于( )。

对于理想气体,下列( )参数仅仅取决于温度。

热力学第二定律的说法很多,下列几种说法中,哪种说法是错误的?

当低温热源的温度趋近于0k时,卡诺热机的热效率( )。

某科学家设想利用海水的温差发电。设海洋表面的温度为20℃,在500m深处海水的温度为5℃。如果采用卡诺循环,其热效率是( )%。

第二类永动机是不可能制成的,因为违反了( )。

从热源取热1000 kj,对外作功1000kj的热机是不可能实现的,因为( )。

夏天适合我国情况的室内舒适温度为 26~27℃。从节能的角度分析,应该将空调室内温度设定为( )。

我国冬季居民室内供暖设计温度为18~22℃,为了节能电能,应设定空调使室内温度为( )。

对于 标签,其中*代表get或?

定义列表的html代码是?

定义盒模型外补丁的时候是否可以使用负值?

当希望使图片的背景是透明的时候,应该使用的图像格式是?

当链接指向下列哪一种文件时,不打开该文件,而是提供给浏览器下载?

关于web标准的描述,下列说确的是()

关于建立站点的作用,下列说确的是( )

网页主要由文字、图像和超链接等元素构成,但是也可以包含音频、视频以及flash等。

网站的根目录中主要包括css和images等文件夹。( )

在万维网上的所有文件(html、css、图片、音乐、视频等)都有唯一的url,只要知道资源的url,就能够对其进行访问。()

创建一个样式表,可以设置当前页面中id为compact元素的内容的字体为斜体。下列能实现该功能的代码是?

创建一个位于文档内部位置的链接的代码是?

创建一个滚动菜单的html代码是?

只显示一个边框?

表示显示的边框的数为?

matlab矩阵计算

两道题选做一道

part i: choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

part ii: the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

part iii: the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

part iv: listening comprehension: in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

part ii. passage (shadowing and gist) directions: listen to the passage and choose the best answer to each of the following questions. what does the speaker really describe in the speech?

irections: listen to the passage and choose the best answer to each of the following questions. how do specialists comment on this study method?

directions: listen to the passage and choose the best answer to each of the following questions. how effectively can the average person learn during sleep as in the same period during the day?

directions: listen to the passage and choose the best answer to each of the following questions. what does sleep-teaching do?

directions: listen to the passage and choose the best answer to each of the following questions. what did the student have to do for another three hours before having breakfast?

part iii. news (shadowing and gist) a. directions: listen to the news item and complete the following summary. this news item is about .

directions: listen to the news item and choose the best answer to complete the following sentences. opposition parties are demanding after a violent protest over voting problems tuesday.

there were at least killed and injured during the voting.

people at more than 100 voting places .

show the ruling general people’s congress party in the lead.

part i (note-taking) directions: listen to a talk about light and health. take notes and complete the following summary. can light affect your health? many researchers believe that light can affect both your physical and your (1) .

from daylight, our bodies absorb vitamin d through the skin. certain skin diseases also (2) from exposure to sunlight.

light absorbed through the eye can stimulate hormone production, which in turn (3) our mood.

some people become (4) in winter, when the days are dark and most people spend less time in the open air.

when spring comes, these (5) disappear. researchers have called this condition sad -- seasonal affective depression.

the condition can be (6) by exposing patients to special lights, known as full-spectrum lights.

this lighting has also been used to treat patients (7) from jet-lag, to improve learning in school-children in russia and america,

and the (8) of japanese factory workers

young people need at least fifteen minutes a day in real daylight in summer (9) in winter.

old people, who risk vitamin d deficiency, should spend even longer exposed to (10) daylight.

peak performances - moments when children (1) that's in them -

are the stuff of every parent's (2) .

and yet most of us have seen a report card or heard a trumpet solo that (3)

what our kids can (4) .

why can some boys and girls repeatedly pull themselves to the (5)

while others of equal or (6) cannot?

many parents assume skill is pretty much determined by (7)

the student with the highest i.q. will get the best grades, or the athlete with the most prowess will (8) .

genes (9) in determining performance, but they're not everything.

the edge comes from mental attitude, character and (10) .

there are some simple ways for parents to help their youngsters develop those (11)

find something to praise. a child who feels good about himself (12)

assess your child's (13)

encourage self-applause. knowing how to relax is key to (14) .

a good report card (15) near your daughter's mirror reminds

her that she can do well and (16) to repeat her success.

there are no (17) to bringing your child to do his best.

it's a (18) of support, encouragement and hard work.

and those efforts (19) not only in peak performance

not only in peak performance but also in (20) between parent and child.

corporate culture corporate culture is described as the (1) _____________ of an organization, and guides how employees think, act, and feel.

it includes core values and beliefs, corporate ethics, and rules of behavior. it can be expressed in the company’s mission (2) _____________ and other communications,

in the architectural style or interior (3) _____________ of offices, and in the titles given to various employees. corporate culture affects you in many ways.

for instance: l the (4) __________ __________ per day, per week.

the (5) __________ __________, including employee interaction, competition degree, etc.

the (6) __________ __________, including the accepted styles of attire, etc.

the (7) __________ __________ you get, including cubicles, window offices, etc.

the (8) __________ __________ development.

onsite perks, such as break room, play room, etc. l the (9) __________ __________ outside the office.

(10) _____________ with other employers.
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