设电子静止质量为me，将一个电子从静止加速到速率0.6 c (c表示真空光速)，需作功为0.25mec2。
已知一静止质量为m0的粒子，其固有寿命为实验室测量到的寿命的1/n，则此粒子动能为nm0c2。
according to national standard, which of the following are preferred scales?
which of the following heights are provided in national standards?
the symbol "gb/t 14689-2008" denotes that the concern national standard is compulsory.
when we make a drawing, a frame should be drawn inside of the outmost edges of the drawing sheet. there are two styles of drawing sheet layout: with a filling margin and without a filling margin.
which of the following lines are used as dimension lines, extension lines, leader lines, construction lines, section lines and projection lines?
which of the following are the projection rules of the projections of points？
what are the projection properties of frontal line?
if a line is an oblique line, the projections of the line will be foreshortened lines in the three planes of projections.
the connecting line between the spacial point and its horizontal projection reflects the distance of the point to the horizontal plane of projection, and it equals the coordinate x of the point.
according to the difference of x coordinates of the two points, we can tell the relative position of these two points in front-rear direction.
which of the solid can we make lines on its surfaces?
when we need to make a point on the surface of a solid, on which of the following solid the auxiliary latitude circle method can be used?
when making projections of points in the conical surfaces of cones and spherical surfaces on spheres, auxiliary element method and auxiliary latitude circle method can both be used.
when a sphere is cut by a plane at any location, all of the projections of the produced intersection are circles.
when dimensioning a composite solid which is formed by cutting, the dimensions should be given at the location where the solid is cut.
when the views of a composite solid formed by adding are drawn, the solid can be considered as formed by all features, and then the views of the features are drawn one by one. in the process of drawing views of the features, we should keep in mind that the composite solid is a whole solid.
which of the usages of center lines in views are correct?
the isometric projection of a frontal circle is an ellipse. the minor axis of the ellipse is in coincidence with , and the major axis of the ellipse is perpendicular to .
the isometric projection of a profile circle is an ellipse. the minor axis of the ellipse is in coincidence with , and the major axis of the ellipse is perpendicular to .
what representation methods are included in the method "view",that is, non-sectioned view?
choose the properties of the general section line from the following description.
in occasions of representing a relatively complex part, three standard views are not enough to show all the details of the part clearly and completely.
which screw thread term is the nominal diameter?
which options belong to the five important screw thread elements?
in the following options, are standard parts.
which option is the type symbol for pipe threads?
which surfaces are the working surfaces of the key joints?
in dimension φ60f7 in a detail drawing, φ60 is , f is , 7 is .
which of the follow numbers are of ra values?
when a shaft is represented, the axis of it should be placed horizontally.
tolerance is the difference between the permitted minimum and maximum sizes of a part. it also equals the difference between the upper limit deviation and the lower limit deviation.
what of the following are the contents of assembly drawings?
what of the following are indicated in assembly drawings?
what of the following are included in parts lists of assembly drawings?
what of the following are of the special representation methods of assembly drawing?
the methods which can be used in representing machine parts, include regular views, sectional views, removed sections, and the like, which can also be used to represent assemblies.
in using autocad software, the operation sequence of which of the following commands is start the command, select the objects, specify base point, specify second point.
in using autocad software, the following descriptions are about the usages of the command trim, which of the are correct?
in using autocad software, when we draw a rectangle, we should give two points in the rectangle. which of the following description is correct about the two points?
in using autocad software, when the command mirror is used, the mirror line must be center lines.
学好算法与数据结构的关键在于多多实践。
数据结构是（ ）
下列说法错误的是（）
算法的描述方法只有语言方式。
下列关于算法说法错误的是（）
有哪几种存储结构？
算法的效率主要是指（）
在数据结构的讨论中把数据结构从逻辑上分为（）
指出下列程序段的时间复杂度（） sum=1； for (i=0;sum 树形结构中元素之间存在（）关系
i have been working at dell computer for two years. i ______ in examing international contracts to make sure that they are comply with the law.
remploy is a company that employs disabled people. i ______ with the media and try to get us as much good publicity as possible.
shift work means you do your job for part of the week and another person does it for the other part.()
teleworking is suitable to the person who has young children to take care of.()
the job of secretary in office requires hot-desking in order to save office space.（）
regular, fixed hours:______ hours
a temporary job: a ______ job
to work part-time: to work ______
an employer: an ______
a staff(salaried) photographer: a ______ photographer
don't worry. andrew is an excellent host. he will take ______ of you.
we have taken ______ a temporary secretary for three months to help us get through the work.
i think we should take a ______ . we've been discussing this for two hours now.
you should take what she says with a ______ of salt.
the conference will take ______ in new york in october next year.
these files have been zipped up to ____ less disk space.
my personal life has had to ____ my career.
there was no one else to ____ their children.
remember, stick to the issues and don't ____ it personally.
____ a hundred and twenty values and calculate the mean.
the most dynamic societies in the world are the ones that have the most entrepreneurs. these people are the spark in an economy's engine, activating and stimulating economic growth. the entrepreneur looks for opportunities to make a (1)______ by satisfying unsatistied needs, to fill the gap between what consumers want and the products and services that are currently available.
· entrepreneurs are creative, (2)______ and future oriented.
· they are innovators who don't need to follow the tried and (3)______ route.
·they have a natural business (4)_____.
·they are not afraid of (5)______ work for afraid to fail.
·they are willing to take risks with their own(6)______ and resources.
·they are excellent problem solvers and negotiate the legal requirements to launch and (7)______ a business.they focus on sales, cash flow and revenue at all times.complete these phrases by choosing a proper word.
sachiko is trying to get ______ your call.
i'm just ______ your call.
let me ______ that back to you.
i'll call you ______ in an hour.
you can ______ me on this number any time.
the ______ i'm calling is that....
put the most appropriate modal verb into each gap. advertisers of alcoholic drinks ______ make advertisements which could appeal to children.
when advertising a product, you ______ mention the price.
when advertising a product, you ______ make false statements about compes' products.
if you advertise a service, you ______ explain the full terms and conditions, except in the all print.
1. when delegating, you should check up on your staff all the time. because they may forget what you have told them.
2. when delegating, you needn't explain what the rewards are because the staff will not take all their efforts to finish the job if they dont satisy with them.
3. in order to avoid misunderstanding, you'd better ask your staff to explain back what they are going to do.
if you give a _____ in recommendation letter, you give away a piece of your reputation.
our company intends to recruit some new employees with specialist ______ in this field.
this company is specialized in many businesses, _______ from production to travelling.
i hope you can spare some time to visit our company, inspect our products and discuss your particular ______ with us.
the teach told us that christmas ______ on december 25th.
can i ask you to _____ minutes on this meeting?
as the chairperson, mike will _____ the meeting.
there is another memo from the boss telling me to ____ another of his meetings.
tom said he fell aleep when he ______ the novel.
_______ is a type of gambling game in which people buy numbered tickets. several numbers are then chosen, and the people who have those numbers on their tickets win a prize.
if an employee is not ______ the requirement of the boss, he or she would usually be fired.
in order to reduce the cost of the company, the board decided to make some employees in several sectors _____.
if you are not at the office, some callers can leave their message in ______.
which of the following words does not have the similar meaning as “diiss”?
if you _____ your house or land, you use it as a guarantee to a company in order to borrow money from them.
if we catch an employee stealing, they ______ a verbal warning.
i am not sure what happened exactly. the incident needs ______ at quite carefully.
_______ your requirements in the memo about the meeting, i have already made some necessary preparations.
the aim of the report is to _______ whether ms. chuhova was unfairly diissed and if the procedure was followed.
it’s difficult to attract graduates into sales because _____.
______ means making a speech to convince people to buy something.
_____ is a kind of sales of making an unexpected phone call or visit to sell something.
the business trips with lots of free entertainment are usually called _____.
selling is one of those things that can happen to anyone, no _____ what their job description is.
different from marketing, sales has some direct effects on company and can create some _____ results.
it is important for the salesperson to ______ that the benefits of their products or services match the consumers’ requirements.
it is more _____ for salesperson to think through what the customers’ needs are than to directly ask “what do you need?”
it _____ without saying that word of mouth is the best advertisement.
the goal of staff training is to enhance employee quality, improve productivity and meet future needs of the ______.
after the staff training, the company need some ______ system to test the effects of training.
genrally speaking, there are two ways of staff training: the traditional face-to-face training and ______ training.
when writing a complaint letter, we had better use _____ voice to make the statement seem objective.
i prefer learning by myself to ______ the staff training of the company.
if i am working at my desk, i always stop _____ the phone.
_____ having written to them for a long time, she has received no reply.
_____ further increases in your prices, we are changing supplier.
i have complained about the problem twice before. _____, you have taken no action to resolve the issue.
the whole process of staff training includes needs ysis, instruction design, ______, implementation and evaluation.
choose a word from the passage in page 87, and fill in the blank in its right form. this year turnover has _______ (increase fourfold) as more marketers use scents to distinguish their brands.
some companies want to make shoppers wait around longer in the hope they will spot something to buy.
we often use phrasal verbs on the telephone. –can you wait for me for a second? we can also say “please ________.”
the new product _______ goes on sale next month isn’t ready yet.
the turnover was just under half a million ______ it was first founded in 1985. now it’s a hundred million.
he ______ a paper strip inside and waves it under his nose, breathing in deeply.
a jingle is a short tune used in advertising and for other commercial uses. the jingle contains one or more hooks and meaning that explicitly promote the product being advertised, usually through the use of one or more advertising slogans.
the brand identity is the representation of the company's reputation through the conveyance of attributes, values, purpose, strengths, and passions.
the explorer took only such men and things _______ he really needed into the jungle.
你能否帮我转接销售部？ can you ____ me _______ to the sales department?
management means the organization and coordination of the activities of a business in order to achieve defined objectives.
the basic task of management includes only marketing.
the activities associated with running a company, such as controlling, leading, monitoring, organizing, and planning.
madonna’s five dimensions of her successful strategy are_________ and to exploit your competences, address your weaknesses.
similarly, managers who don’t set career goals will _______ opportunities.
if only you do your very best, you will _________ success in everything.
you must ________ your weakness and then you may overcome and make use of it.
i don't know if it ______tomorrow. if it ______,we won’t go on a picnic.
susan will not arrive at the airport on time _______ she hurries up.
________your efforts, each of you has great wealth.
ethical economics is an oxymoron. it will make the economic system unfair.
green growth means fostering economic growth and development, while ensuring that natural assets continue to provide the resources and environmental services on which our well-being relies.
sustainable development will compromise the ability of future generations to meet their own needs.
the three pillars of sustainable development–economic growth, environmental stewardship, and social inclusion.
the coffeeconomics is an alternative economics research field to evaluate the coffee market structure behavior from a _____ and ________perspective.
gdp means _________.
because of _______, both signs can learn from one another if they can agree to meet halfway.
from behind, she looked as all and _______ as a child.
they _______ your memories; where you were, what you were doing, what you were interested in, what you were thinking of.
business law, also called commercial law or mercantile law, the body of rules, whether by convention, agreement, or national or international legislation, is governing the dealings between persons in commercial matters.
business law only includes company law, partnership act, law on sole proprietorship enterprises, and maritime law.
bylaw is a law made by local government that only relates to its particular region.
to franchise a right to sell a company's products in a particular area using the company's name.
prosecute means making a legal case against someone and claiming for money.
judge is the person in charge of a court who makes legal decisions.
the lawer is the person who gives legal advice and represents a person in court.
both sides met in order to try to resolve their differences.
他勇敢顽强地与疾病作斗争。 he fought the illness with courage and ________.
我们应该分清是非。we should make a distinction between right and wrong.
max bray, a business lecturer, thinks office workers still distrust computers.
technology is unreliable in most of people’s eyes. false.
worldwide, the amount of paper used for each year continues to rise, although statistics now show a slight reduction in the amount consumed in the uk.
if you are sent an important email, you are likely to print it, because there is always the fear that it might have get deleted.
your part in these meetings will dictate the kind of information you need and how you should prepare for them.
total group sales climbed by five percent to $`55 million, with the agricultural business delivering yet another record_____.
sales in the garden equipment_____ were slow in the early months of the year, but increased dramatically in the final quarter.
it is my belief that we have continued to grow by_____ our customers well.
many people nowadays save money to _c _ for their old age. a cater b supply c provide d equip
after checking the foods against your invoice, we discovered a considerable shortage ______ number.
the report is to be ______ to the directors as soon as possible.
i am glad that i feel quite _____ for the position you advertised.
we recommended ______ａall quantity for trial.
______the quality, you must assure that we would get the goods produced in 2019.
______we appreciate your cooperation in giving us the information about your market, we regret that we are unable to reduce our price to the level you indicated.
we shall appreciate it if you will effect shipment as soon as possible, thus ______ our buyers to catch the brisk demand at the beginning of the season.
i am writing ______ your advertisement for the position of conference manager.
i will phone you next week after you ______ a chance to go over the material.
i am sending you a check of $1500 ______ full payment of my account.
will you please let us have a selection of goods which you think are ______ for your market?
i was ______ to hear how popular our computer games have been with your customers.
we have received your letter of september 12, ______ we are glad to know that you are interested in our electric heaters.
each buyer should do his best to obtain the most ______ prices.
we assure you of our full ______ in executing the contract.
we thank you for your letter of may 5th, ______ your purchase from us of 5000 tons of green beans.
we think it would be ______ to take in orders from those firms whose standing and financial position are yet unknown.
may i suggest that we send a technician to inspect the equipment and make the necessary repairs at a ______ cost.
90% of the credit amount must be paid ______ the presentation of docuements.
when planning a presentation, it is important to pay attention to the audience and get to know their background.
when introducing a new product range onto the market, advance publicity is important as it could help raise awareness of potential consumers.
it reflects the effort over the past five years that has gone into transforming of our company into a highly competitive world-class business.
we believe that we know exactly what extra this is and we have already put into place organizational and technical changes to bring this about.
this performance has been achieved in the most toughest market conditions we have seen for many years yet.
fine fitness, the health and fitness club operator_______ an impressive set of results yesterday.
reporting a 38 percent jump in annual pretax profits, the company claimed that it had______ none of the problems revealed last week by its rival, top fit.
the company opened 12 new clubs in the past year,________ its total to 51.
even the more__________ clubs are still seeing sales growth.
this can be seen as clear______ of the appeal of fine fitness.