《证劵投资分析》名师预测卷1搜答案神器-2024欧洲杯竞猜官方平台

化学问答 1372

as a business assistant, you need good _________ skills.

as a teaching/training assistant, you need the _________ and planning skills.

as a business assistant, you need _______.

as a teaching/training assistant, you need _______.

as a business assistant, you need _______.

the purpose of a resume is _________.

you need a _________ in your resume to hold your reader’s attention.

the profile usually consists of 30 to 50 words to highlight your main ______ and experience.

to get ready for the job interview, you need _______.

it's important to always have one good ________ to wear.

use the internet to find information about the company, its___________, and the jobs the company typically hires for.

the safe standard interview clothing for men is ___________.

in a job interview, the suit can be worn with _______.

for women, classic _________ or neutral color pumps are appropriate for any job interview.

during the interview, always focus your vision on _________ to show your respect and attention.

the core teacher competencies required for successful teaching also include competencies or behaviors such as __________(解决问题能力) and judgment, __________(适应能力) and high energy levels.

the goal of a resume is not to get you a job or to win you a _________(合同), but to get you an __________ (面试)or meeting.

print out extra copies of your _________(简历) and any other ___________(证书) you want to show to the employer.

in a job interview, the color of your tie should be ________(更暗) than the color of your shirt and avoid a tie that is too ________(鲜艳的).

exhibitions are very important _____ opportunities for companies.

which of the following is not the benefits of attending a trade shows for a company?

organizing your participation for a trade fair is very important to ___ that the trade fair is a success.

which of the following is not true as for the preparations for attending a trade show?

make sure all the promotional materials for trade shows should be _____ designed.

which of the following should be prepared before attending a trade show?

the qualified trade show staff should be knowledgeable about the company and the products, ______ proactive and ______ about attending the trade show.

which of the following is not the appropriate trade show etiquettes?

which of the following booth type is superior in location and can attract most of the visitors?

which of the following is not true as for the preparation of products before attending a trade show?

which of the following is not the promotional materials for a trade show?

don’t forget to ____ flight tickets and other travel arrangements.

______ (态度) is one of the most important trade show _______ (礼仪).

before ______ ____ (申请)a booth, we need to decide on the objective first.

the roast beef looks good. let me have a ( ).

as a chinese tradition, you cannot ( ) a fish during a meal.

have you finalized the ( ) for tomorrow’s meeting?

why do they always ( ) meetings for friday afternoon? it is the worst time.

ok, that’s all for today. the next ( ) meeting will be the first week of the month, as usual.

who’s gonging to take ( ) for today’s meeting?

i’m sorry i can’t ( ) the meeting tomorrow; i’m out of the office all day.

we can’t ( ) the meeting in this room; it’s not big enough.

the problem isn’t really our ( ).

the delay is ( ) to production problems at the factory.

your bike was ordered the last week in march, and ( ) was expected the last week in march.

i would like to ( ) the reservation of one double room for 21st-22nd april.

slurping ( ) is considered a courtesy in japan but not in other countries.

please note that you must present the same ( ) card on arrival at the hotel.

the person who cleans your room is called a ( ) maid.

please fasten your seat belts for _______ _______(起飞).

passengers in _______ _______(商务舱) can board now.

please show your ______ ______ (登机牌)on request.

to call a _____ _______(空乘), please press the button above your head.

you must ____(不) leave your _______ (行李)unattended at any time.

could you _____ (发)me an _____ (电邮)with the booking details?

you’re too late to check in now. the ______(航班)is already ______(登机).

you can ____ (预定)in advance or you can ____ (购买)a ticket on the day.

_______ is the process of letting consumers know why they should choose your product or service over those of your compes’.

to effectively market a product or service, it's important to identify what _____ it from competing products or services.

_______ is important to consider when determining areas of distribution.

the sale price of the product reflects what consumers are ____ to pay for it.

determination of the best mediums to communicate the message and decisions about the ______ of the communication also are important.

______ is the process of actually convincing someone to buy from your business.

to convince prospective buyers, customers, and investors, you need to make your presentation sound more ________.

if you _____ these 5 digital strategies, you could be on your way to creating a concrete internet marketing strategy that helps you brings in more customers and retain new ones.

for a business to “sells something to someone” the business must have the right ___, in the right place, and for the right ____.

marketing professionals need to consider costs related to research and development, _______ , marketing, and________—otherwise known as cost-based pricing.

joint marketing campaigns also are called a promotional mix. activities might include _______, sales promotion, ________, and public relations.

strong sales techniques are vital to driving business ___ and ____.

our main products are silk garments, for both _____ and ______markets.

the safco desk is 48 inches wide, 27 inches____ and about 30 inches____.

search engine _____ and ______are part of what helps make your business appear higher on a list of search engine results.

your blog becomes somewhere you can offer ______, share bits of information, and really ____ with your customers.

in unit 5, we will deal with 4 major steps in the business negotiation: price negotiation, payment terms, shipment and the __________.

which of the payment terms is the safest one? __________

which of the following payment terms is the easiest to handle? __________

in terms of fee, which of the following payment terms is the cheapest? __________

which shipping document is the official contract between the shipper or owner of goods and the freight carrier? __________

which shipping document is a list of goods information detail needed for transportation purpose? __________

in business negotiation, which of the following sentence can be used to check the contract clauses? __________

in business negotiation, which of the following sentence can be used to confirm other terms like payment terms? __________

which of the following documents is not to be prepared by the seller? __________

for new customers, __________(信用证) is the better choice while for old ones, __________ (电汇)is the best choice followed by d/p or d/a.

there are 5 major types of shipping documents you need for international shipping: __________(提单), packing list, commercial invoice, __________(保险单) and certificate of origin.

the first step to deal with customer’s complaint is to ______.

you can ______ back to the customer what they're saying to show that you really understand what they said.

you can use the structure “_______________” to repeat the customer’s questions.

what is the best way to apologize?

what is the appropriate way to say thank you?

how to deal with mr. know-it-all?

vacation at disney world is going to be a once-in-a-lifetime __________ for us.

when the customer gets very angry, and maybe they start swearing. don't get ______.

i am really sorry. i understand your situation is very __________ right now.

the best way to handle an angry customer is to let them ______ out.

remember, angry customers are not blaming you; they are blaming the company so do not take anything ____________.

in this age of automation and instant gratification, a little ______________ goes a long way.

you're telling customers that you care that they know how to use your product and they can also learn something new by ______.

delighting your customers is a __________ aspect of your business growing better.

everyone loves __________.

what does last stand for in customer service? l: listen a: __________ s: ____________ t: thank

if you don’t know what to do, you can tell them by saying: i'm not ______ (把握)how to resolve this situation. let me ______ (确认)with my manager.

mr. one-word is usually just ______(沉默的) but also________________(注重细节的).

the safe standard interview clothing for men is ___________.

during the interview, always focus your vision on _________ to show your respect and attention.

organizing your participation for a trade fair is very important to ___ that the trade fair is a success.

the qualified trade show staff should be knowledgeable about the company and the products, ______ proactive and ______ about attending the trade show.

which of the following booth type is superior in location and can attract most of the visitors?

the delay is _______ to production problems at the factory.

the person who cleans your room is called a _____ maid.

to effectively market a product or service, it's important to identify what _____ it from competing products or services.

if you _____ these 5 digital strategies, you could be on your way to creating a concrete internet marketing strategy that helps you brings in more customers and retain new ones.

which shipping document is a list of goods information detail needed for transportation purpose?

you can ______ back to the customer what they're saying to show that you really understand what they said.

the best way to handle an angry customer is to let them ______ out.

print out extra copies of your _________(简历) and any other ___________(证书) you want to show to the employer.

please fasten your seat belts for _______ _______(起飞).

you must ____(不) leave your _______ (行李)unattended at any time.

for a business to “sells something to someone” the business must have the right ___, in the right place, and for the right ____.

the safco desk is 48 inches wide, 27 inches____ and about 30 inches____.

if you don’t know what to do, you can tell them by saying: i'm not ______ (把握)how to resolve this situation. let me ______ (确认)with my manager.

冲压件的尺寸稳定,互换性好,是因为其尺寸公差主要由 来保证。

冲压生产过程的主要特征是,依靠 完成加工,便于实现自动化,生产率很高,操作方便。

冲压加工是利用安装在压力机上的模具对材料施加变形力,使其产生 ,从而获得冲件的一种压力加工方法。

冲模的制造一般是单件小批量生产,因此冲压件也是单件小批量生产。

冲压生产的自动化就是冲模的自动化。

冲压加工只能加工形状简单的零件。

冷冲压加工获得的零件一般无需再进行机械加工,因而是一种节省原材料、节省能耗的少、无切削的加工方法。

冷冲压不仅可以加工金属材料,而且还可以加工非金属材料。

因为冷冲压主要是用板料加工成零件,所以又叫板料冲压。

落料属于( )工序。

从板料上冲下所需形状的工件或毛坯,称为____。

冷冲压可分为分离工序和 。

模具沿封闭的轮廓线冲切板料,冲下的部分是工件的冲裁工艺叫(  )。

曲柄压力机分为曲轴压力机和偏心压力机,其中偏心压力机具有(  )特点。

用于高速压力机的冲压材料是___________。

下列属于常用冲压材料的是 。

冷冲模按工序组合形式可分为单工序模具和组合工序模具,前一种模具在冲压过程中生产率低,当生产量大时,一般采用后一种摸具,而这种模具又依组合方式分为( )、( )、( )等组合方式。

把两个以上的单工序组合成一道工序,构成复合、级进、复合-级进模的组合工序。

成形工序是指对工件弯曲、拉深、成形等工序。

成形工序是指坯料在超过弹性极限条件下而获得一定形状。

复合工序、连续工序、复合—连续工序都属于组合工序。

落料和弯曲都属于分离工序,而拉深、翻边则属于变形工序。

模制造的主要特征是单件小批量生产,技术要求高,精度高,是高密集型生产。

冲压模具是利用压力机对金属或非金属材料加压,使其产生分离或变形而得到所需要冲件的工艺装备。

压力机的闭合高度是指模具工作行程终了时,上模座的上平面至下模座的下平面之间的距离。

滑块每分钟行程次数反映了生产率的高低。

按压力机的滑块数目分,曲柄压力机可分为单点、双点和四点压力机。

物体受三向等拉应力时,坯料不会产生任何塑性变形。

物体某个方向上为正应力时,该方向的应变一定是正应变。

金属的柔软性好,则表示其塑性好。

屈强比越小,则金属的成形性能越好。

材料的成形质量好,其成形性能一定好。

冲压模具的材料主要是指工作零件的材料。

冲裁变形过程中的塑性变形阶段形成了___________。

冲裁件的工艺性分析,主要从冲裁件的 、冲裁件的精度和冲裁件的断面质量等三方面进行。

连续冲裁排样时,切断工序必须安排在(  )工位。

凸模比凹模的制造精度要____。

模具的压力中心就是冲压力___________的作用点。

冲裁多孔冲件时,为了降低冲裁力,应采用___________的方法来实现小设备冲裁大冲件。

精度高、形状复杂的冲件一般采用__________凹模形式。

弹性卸料装置除起卸料作用外,还有__________的作用。

压入式模柄与上模座呈_________的配合,并加销钉以防转动。

冲裁凹模刃口形式的选择,主要应根据以下要素来决定_____。

冲裁模的台阶式凸模安装部分(固定部分)与凸模固定板的孔的配合采有(  )。

冲模定位零件的作用是为了_____。

采用弹压卸料板的普通冲裁模具,弹压卸料板具有作用(  )。

生产中常用顶件装置有以下几种结构形式_____。

冲裁根据变形机理的不同,可分为普通冲裁和精密冲裁。

冲裁既可以直接冲制成品零件,又可以为其他成形工序制备毛坯。

冲裁件的塑性差,则断面上毛面和塌角的比例大。

冲裁间隙过大时,断面将出现二次光亮带。

冲裁毛刺是在刃口附近的側面上材料出现微裂纹时形成的。

手工送料,有侧压装置的搭边值可以小些,刚性卸料的比弹性卸料的搭边值大些。

冲裁件在条料、带料或板料上的布置方式叫排样。

搭边值的作用是补偿定位误差,保持条料有一定的刚度,以保证零件质量和送料方便。

对配作加工的凸、凹模,其零件图无需标注尺寸和公差,只说明配作间隙值。

对配作加工的凸、凹模,其零件图无需标注尺寸和公差,只说明配作间隙值。

冲裁凸、凹模的工作端部要求有光滑的圆角。

冲裁力是由冲压力、卸料力、推料力及顶料力四部分组成。

斜刃比平刃的冲裁力大。

在复合模中,凸凹模的断面形状与工件完全一致。

在级进模中,落料或切断工步一般安排在最后工位上。

导料销导向定位多用于单工序和复合模中。

凸模较大时,一般需要加垫板,凸模较小时,一般不需要加垫板。

在进行弯曲模结构设计时,应注意模具结构能保证弯曲时上、下模之间水平方向的错移力________。

弯曲件在变形区内出现断面为扇形的是_______。

弯曲时的变形程度以(  )表示。

弯曲件的最小相对弯曲半径是限制弯曲件产生________。

不对称的弯曲件,弯曲时应注意________。

当弯曲件外形尺寸有要求时,应先确定(  )工作部分的尺寸。

当工作所需的弯曲半径小于最小弯曲半径时,应采取如下措施来保证弯曲质量_____。

板料塑性弯曲的变形特点是:

影响弯曲件回弹现象的因素有 _____。

在弯曲变形区内,内缘金属的应力状态因受压而缩短,外缘金属受拉而伸长。

塑性变形时,金属变形区内的径向应力在板料表面处达到最大值。

从应力状态来看,窄板弯曲时的应力状态是平面的,而宽板弯曲时的应力状态则是立体的。

冲压弯曲件时,弯曲半径越小,则外层纤维的拉伸越大。

弯曲件需多次弯曲时,弯曲次序一般是先弯外角,后弯内角;前次弯曲应考虑后次弯曲有可靠的定位,后次弯曲不能影响前次以成形的形状。

相对弯曲半径r╱t越大,则回弹量越大。

减小回弹的有效措施是采用校正弯曲代替自由弯曲。

通用弯曲模一般应用于小批量生产或试制生产的弯曲件。

对于u形件弯曲模,应当选择合适的间隙,间隙过小,会使工件弯边厚度变薄,降低凹模寿命,增大弯曲力;间隙过大,则回弹大,降低工件的精度。

板料的相对厚度t/d较大时,则抵抗失稳能力__________。

拉深过程中,坯料的凸缘部分为__________。

拉深时,在板料的凸缘部分,因受__________作用而可能产生起皱现象。

经过热处理或表面有油污和其它脏物的工序件表面,需要__________方可继续进行冲压加工或其它工序的加工。

为了使材料充分塑性流动,拉深时坯料形状与拉深件横截面形状是__________。

选择拉深设备应当考虑____。

利用压边圈对拉深坯料的变形区施加压力,可防止坯料起皱,因此,在保证变形区不起皱的前提下,应尽量选用__________。

拉深时,要求拉深件的材料应具有(  )。

拉深时,拉深件的壁厚是不均匀的,上部增厚,愈接近口部增厚愈多,下部变薄,愈接近凸模圆角变薄愈大。壁部与圆角相切处变薄最严重。

拉深系数越小,说明拉深变形程度越大。

坯料拉深时,其凸缘部分因受切向压应力而易产生失稳而起皱。

起皱是一种受压失稳现象。

需要多次拉深的零件,在保证必要的表面质量的前提下,应允许内、外表面存在拉深过程中可能产生的痕迹。

在拉深成形中,需要摩擦力小的部位必须进行润滑,凹模表面粗糙度应该小,以降低摩擦力,减小拉应力,以提高极限变形程度。

一般情况下,拉深件的公差不宜要求过高。对于要求高的拉深件应加整形工序以提高其精度。

因材料性能和模具几何形状等因素的影响,会造成拉深件口部不齐,尤其是经过多次拉深的拉深件,起口部质量更差。因此在多数情况下采用加大工序件高度或凸缘直径的方法,拉深后再经过切边工序以保证零件质量。

拉深的变形程度大小可以用拉深件的高度与直径的比值来表示。也可以用拉深后的圆筒形件的直径与拉深前的坯料 (工序件)直径之比来表示。

压料力的选择应在保证变形区不起皱的前提下,尽量选用小的压料力。

首次拉深模是把坯料拉压成外形更小而厚度没有明显变化的空心体模具。

拉深凸模圆角半径太小,会增大拉应力,降低危险断面的抗拉强度,因而会引起拉深件拉裂,降低极限变形。

双动压力机可以同时进行正、反拉深。

空心坯料胀形方式一般可分为几种____。

以下工序不属于伸长类变形的是(  ) 。

翻孔的变形程度以___表示。变形程度越大,其值越(  )。

由于胀形时坯料处于双向受拉的应力状态,所以变形区的材料不会产生失稳现象,成形以后的冲件表面光滑、质量好。

由于胀形时坯料处于双向受拉的应力状态,所以变形区的材料不会产生破裂。

胀形变形时,由于变形区材料截面上的拉应力沿厚度方向分布比较均匀,所以卸载时的弹性回复很小,容易得到尺寸精度高的冲件。

胀形时,当坯料的外径与成形直径的比值d/d>3时,d与d之间环形部分的金属发生切向收缩所必需的径向拉应力很大,成为相对于中心部分的强区,以致于环形部分金属根本不可能向凹模内流动。

胀形时,坯料变形区受两向拉应力的作用,因此,可能产生的最大问题是起皱。

翻孔的变形程度以翻孔前孔径d与翻孔后孔径d的比值k来表示。k值愈小,则形程度愈大。

压缩类外缘翻边特点是:变形区主要为切向受压,在变形过程中,材料容易起皱,其变形程度用 来表示。

在缩口变形过程中,坯料变形区受切向和径向压应力的作用,而切向压应力是最大的主应力,使坯料直径减小,壁厚和高度增加,因而切向可能产生失稳起皱的现象。

缩口的极限变形程度主要受失稳起皱的限制,防止失稳是缩口工艺要解决的主要问题。

校平和整形工序大都是在冲裁、弯曲、拉深等工序之后进行,以便使冲压件的平面度、圆角半径或某些形状尺寸经过校形后达到产品的要求。

校形与整形工序的特点之一是:只在工序件局部位置使其产生不大的塑性变形,以达到提高零件的形状与尺寸精度的要求。

整形工序一般安排在拉伸弯曲或其他工序之前。

冲压件的尺寸稳定,互换性好,是因为其尺寸公差主要由 来保证。

落料属于( )工序。

从板料上冲下所需形状的工件或毛坯,称为____。

冲裁变形过程中的塑性变形阶段形成了___________。

冲裁件的工艺性,是指冲裁件对冲裁工艺的 。

为了保证条料定位精度,使用侧刃定距的级进模可采用 ______。

模具的合理间隙是靠__________刃口尺寸及公差来实现。

对t形件,为提高材料的利用率,应采用__________。

采用模具标准件,不仅可以有效(  )模具质量,而且可以(  )模具生产成本并大大(  )模具生产周期。

冲裁模导向件的间隙应该( )凸凹模的间隙。

在进行弯曲模结构设计时,应注意模具结构能保证弯曲时上、下模之间水平方向的错移力________。

不对称的弯曲件,弯曲时应注意________。

拉深后坯料的径向尺寸__________,切向尺寸__________。

用等面积法确定坯料尺寸,即坯料面积等于拉深件的_________。

空心坯料胀形方式一般可分为几种____。

冲压加工是利用安装在压力机上的模具对材料施加变形力,使其产生 ,从而获得冲件的一种压力加工方法。

冷冲模按工序组合形式可分为单工序模具和组合工序模具,前一种模具在冲压过程中生产率低,当生产量大时,一般采用后一种摸具,而这种模具又依组合方式分为 、 、 等组合方式。

冲裁凹模刃口形式的选择,主要应根据以下要素来决定_____。

冲裁模的台阶式凸模安装部分(固定部分)与凸模固定板的孔的配合采有(  )。

冲模定位零件的作用是为了_____。

采用弹压卸料板的普通冲裁模具,弹压卸料板具有作用(  )。

当工作所需的弯曲半径小于最小弯曲半径时,应采取如下措施来保证弯曲质量_____。

板料塑性弯曲的变形特点是:

拉深时,要求拉深件的材料应具有(  )。

以下工序不属于伸长类变形的是(  ) 。

冷冲压加工获得的零件一般无需再进行机械加工,因而是一种节省原材料、节省能耗的少、无切削的加工方法。

冷冲压不仅可以加工金属材料,而且还可以加工非金属材料。

因为冷冲压主要是用板料加工成零件,所以又叫板料冲压。

成形工序是指对工件弯曲、拉深、成形等工序。

分离工序是指对工件的剪裁和冲裁工序。

复合工序、连续工序、复合—连续工序都属于组合工序。

滑块每分钟行程次数反映了生产率的高低。

屈强比越小,则金属的成形性能越好。

冲压模具的材料主要是指工作零件的材料。

冲裁根据变形机理的不同,可分为普通冲裁和精密冲裁。

从广义来说,利用冲模使材料相互之间分离的工序叫冲裁。它包括冲孔、落料、切断、修边等工序。但一般来说,冲裁工艺主要是指冲孔和落料工序。

搭边值的作用是补偿定位误差,保持条料有一定的刚度,以保证零件质量和送料方便。

冲裁模类型首先决定于生产批量,冲裁件的质量要求和\形状尺寸是确定冲裁模类型的重要依据。

在生产实际中,倒装式复合模比正装式复合模应用更多一些。

复合模的凸凹模壁厚最小值与冲模结构有关,顺装式复合模的凸凹模壁厚可小些;倒装式复合模的凸凹模壁厚应大些。

定位零件是指用于确定条料或工件在模具中的正确位置的零件。

对于落料模、含有落料的复合模及级进模,必须绘出排样图。

弯曲件的精度受坯料定位、偏移、回弹,翘曲等因素影响。

足够的塑性和较小的屈强比能保证弯曲时不开裂。

冲压弯曲件时,弯曲半径越小,则外层纤维的拉伸越大。

一般情况下,拉深件的公差不宜要求过高。对于要求高的拉深件应加整形工序以提高其精度。

拉深凹模圆角半径大,允许的极限拉深系数可减小,但过大的圆角半径会使板料悬空面积增大,容易产生失稳起皱。

由于胀形时坯料处于双向受拉的应力状态,所以变形区的材料不会产生失稳现象,成形以后的冲件表面光滑、质量好。

校平和整形工序大都是在冲裁、弯曲、拉深等工序之后进行,以便使冲压件的平面度、圆角半径或某些形状尺寸经过校形后达到产品的要求。

压缩类外缘翻边特点是:变形区主要为切向受压,在变形过程中,材料容易起皱,其变形程度用 来表示。

在后前位片上,心脏呈主动脉型,心腰凹陷,左心缘下段延长,相反搏动点上移,左侧位和左前斜位显示心后缘下段向后突出,与脊柱重叠,应考虑为

在可编辑多边形建模中,可以在两条边上创建新的边,这个命令是( )

{图}

下列关于财务杠杆的说确的是( )

血管形成术的禁忌证包括

下列属于杠杆收购创造价值的原因的是( )

胰腺癌可以采用经导管动脉栓塞术

下列关于股利分配理论的说法中,错误的是( )。

人体mri最常用的成像原子核是( )

关于内含报酬率的说法,正确的是 ( )

酒店通过网站拓展其市场范围的行为是将互联网作为( )工具。

为解决某一特定问题而设计的指令序列称为()

古典园林中私家园林,按照其营建位置不同,可以分为哪些类别?

总体来看,艮岳是一座叠山、理水、花木、建筑完美结合的,以凸显辉煌雄伟之皇家气派为主的园林。

服务产品不涉及转移

购买者数量越少,购买量越大,议价能力越强。

我们可以使用污点修复画笔工具去除人物脸部的斑点。

伊斯法罕的四十柱宫,其宫殿的前面有一个巨大的门廊,门廊由40根柏木做的独立巨柱支撑,因此被称为四十柱宫。

供给管理的主要策略有哪些?

民宿为了扩展市场和营销,建立自己的销售平台,公众号平台、小程序等属于。

请简略阐述跨文化交际的五个层次?

跨文化交际的类型?

请简述非言语交际的定义和功能。

请简述别人对你家乡的刻板印象并分析原因,如何打破刻板印象?

回答全面,涵盖题目要求内容,并生动阐述。

作业题1 画出三相双层绕组展开图,参数如下: z=24,p=2,m=3,y=7,a=2 请按下面步骤完成: 算出槽距电角,画出槽导体电动势星形图; 算出极距,根据极距分极; 算出q,根据q分相,并在星形图中标出各槽对应的相(a, b, c, x, y, z); 根据y连接线圈,根据q连接线圈组 根据a连接相绕组; 画出三相绕组

三相对称绕组流入三相对称电流得到什么样子的磁场?

一台三相双层叠绕组异步电机,电机定子槽数z=36槽,2对极p=2,并联支路数a=2,第一节距y1=7,问其槽电角度为?

一台三相双层叠绕组异步电机,电机定子槽数z=36槽,2对极p=2,并联支路数a=2,第一节距y1=7,问其每极每相槽数q是多少?

一台三相双层叠绕组异步电机,电机定子槽数z=36槽,2对极p=2,并联支路数a=2,第一节距y1=7,问其短距角为多少度

一台三相双层叠绕组异步电机,电机定子槽数z=36槽,2对极p=2,并联支路数a=2,第一节距y1=7,问其因为短距产生的节距因数为

一台三相双层叠绕组异步电机,电机定子槽数z=36槽,2对极p=2,并联支路数a=2,第一节距y1=7,每个线圈有10匝,问其每个线圈组的匝数是多少?

一台三相双层叠绕组异步电机,电机定子槽数z=36槽,2对极p=2,并联支路数a=2,第一节距y1=7,每个线圈有10匝,问其每相绕组一条支路匝数是多少?

交流电机5次空间谐波磁势转速和基波磁势转速的大小关系是?

异步电机因为转子和圆形旋转磁场异步,所以两者之间有相对运动有切割能产生感应电动势,转子电路通路能产生感应电流,此电流在磁场中受力获得电磁转矩,因为电流的产生是感应获得的,所以又称之为感应电机。

并联到大电网的同步发电机,其稳态情况下电机的速度n是由电网频率f和电机自身的极对数p决定的。

5相对称绕组通入5相对称电流也可以获得圆形旋转磁场

交流电机的圆形旋转磁场的旋转方向和相序没有关系

一台三相同步发电机,定子为三相双层叠绕组,y联接,2p=4,z=36槽,,每槽导体数为6,,基波磁通量,基波电动势频率,试求: (1)绕组的基波相电动势; (2)若气隙中还存在三次谐波磁通,,求合成相电动势和线电动势。

三相绕线式异步电动机,额定频率50hz,额定转差率0.04,定子绕组星型联接,定子加额定电压。当转子开路时,测得其滑环上电压为72v,转子每相电阻,每相漏抗。忽略定子漏阻抗压降,试求额定运行时, (1)转子电流的频率; (2)转子电流的大小; (3)转子每相电动势的大小; (4)电机总机械功率。
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