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When Neil Armstrong and Buzz Aldrin returned from the moon, their cargo included nearly fi

fty pounds of rock and soil, which were packed in an aluminum box with seals designed to maintain the lunar surfaces low-pressure environment. But back at Johnson Space Center, in Houston, scientists discovered that the seals had been【C1】______—by moon dust. Lunar dust is fine, like a powder,【C2】______it cuts like glass. Its formed when shooting stars【C3】______on the moons surface, heating its rocks and dirt and reducing them to fine particles. Since theres no wind or water to smooth【C4】______edges, the tiny grains are sharp and uneven, and【C5】______nearly everything. "The intruding【C6】______of lunar dust represents a more challenging engineering design issue, as well as a【C7】______issue for settlers, than does radiation," wrote Harrison Schmitt, an Apollo 17 astronaut, in his 2006 book, "Return to the Moon." The dust damaged space-suits and ate away layers of moon boots. Over the【C8】______of six Apollo missions, not one rock box【C9】______its vacuum seal. Dust followed the astronauts back into their ships, too. According to Schmitt, it smelled like gunpowder and made breathing【C10】______. No one knows precisely what the extremely small particles do to human lungs. The dust not only【C11】______the moons surface, but floats up to sixty miles【C12】______it—as an outer part of its atmosphere, where particles【C13】______the moon by gravity, but are so thin that they【C14】______collide. In the nineteen-sixties, Surveyor probes filmed a glowing cloud floating just above the lunar surface during sunrise. Later, Apollo 17 astronaut Gene Cernan, while orbiting the moon, recorded a【C15】______phenomenon at the sharp line where lunar day meets night. Cernan【C16】______a series of pictures illustrating the changing【C17】______; streams of particles popped【C18】______the ground and hovered, and the resulting cloud came into sharper focus as the astronauts orbiter approached daylight. Since theres no wind to form. and【C19】______the clouds, their origin is something of a mystery. Its【C20】______that theyre made of dust, but no one fully understands how or why they do their thing.

【C1】

A.destroyed

B.stained

C.changed

D.consolidated

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更多“When Neil Armstrong and Buzz Aldrin returned from the moon, their cargo included nearly fi”相关的问题

第1题

写出Armstrong推理规则中自反律、增广律、传递律的形式化定义。
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第2题

在函数依赖中,平凡的函数依赖根据Armstrong推理规则中的()律就可推出。
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第3题

在函数依赖中,平凡的函数依赖根据Armstrong推理规那么中的()律就可推出。
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第4题

_______ at his paper over the weekend,Neil didn't finish it. A.As he worked ha

_______ at his paper over the weekend,Neil didn't finish it.

A.As he worked hard

B.Hard as he worked

C.How he worked hard

D.How hard he worked

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第5题

在函数依赖中,平凡的函数依赖根据Armstrong推理规则中的()律就可推出。
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第6题

以下()不属于Armstrong公理的内容。

A.自反律:若,则

B.合并律:若及,则

C.增补律:若,则

D.传递律:若及,则

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第7题

完成下列各选项 A Countless times in my life I've heard
“ I have the worst memory in the world.I meet some—one and,a minute later,forget his name.’’ Well,I have news for you.That is not always so.Sometimes you do not forget the name.You do not even hear it in the first place. Try to recall(回忆)the last time You met a stranger.The introduction probably sounded something 1ike this:“Mr·Jones,say hello to Mr.Fuzafumer.”What you heard was a mumble (嗫嚅)·The thing to do at this point is to say,“I'm sorry,I didn’t catch your name.” Most people think it isn’t polite to ask to hear a name again.I don't know why.If you make the slightest fuss(大惊小怪)over it,he or she will love you. Here ale five simple rules to help you remember names: 1.Be sure to hear the name. 2·Ask how the name is spelled.This forces you to pay attention. 3·Make a remark about the name—any remark.For example,“0h,I just met a person with the same name.”0r,“What is that name a derivative(派生词)of?”Whatever. 4·Use the name where it is possible during the talk. 5·Use the name again when you say good.bye. Remember this:anything that is meaningful is already half-remembered.Names like Flag,Hunter,Rivers,Armstrong already have meaning.But how will you picture.names like Bartosevitch ? Think of“bought a savage”.If you meet someone named Bill,picture a dollar bill.For Richard,picture someone being rich. The writer thinks that people________ .

A.don’t always forget other's names

B.don’t hear others’names

C.never forget others’names

D.have the worst memory

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第8题

Bosses Say 'Yes' to Home Work Rising costs of office space, time lost to stressful commuting, and

Bosses Say 'Yes' to Home Work

Rising costs of office space, time lost to stressful commuting, and a slow recognition that workers have lives beyond the office—all are strong arguments for letting staff work from home.

For the small business, there are additional benefits too—staff are more productive, and happier, enabling firms to keep their headcounts (员工数) and their recruitment costs to a minimum. It can also provide a competitive advantage, especially when small businesses want to attract new staff but don't have the budget to offer huge salaries.

While company managers have known about the benefits for a long time, many have done little about it, sceptical of whether they could trust their employees to work to full capacity without supervision, or concerned about the additional expenses teleworking policies might incur as staff start charging their home phone bills to the business.

Yet this is now changing. When communications provider Inter-Tel researched the use of remote working solutions among small-and medium-sized UK businesses in April this year, it found that 28% more companies claimed to have introduced flexible working practices than a year ago.

The UK network of Business Links confirms that it too has seen a growing interest in remote working solutions from small businesses seeking its advice, and claims that as many as 60-70% of the businesses that come through its doors now offer some form of remote working support to their workforces.

Technology advances, including the widespread availability of broadband, are making the introduction of remote working a piece of cake.

"If systems are set up properly, staff can have access to all the resources they have in the office wherever they have an internet connection," says Andy Poulton, e-business advisor at Business Link for Berkshire and Wiltshire. "There are some very exciting developments which have enabled this."

One is the availability of broadband everywhere, which now covers almost all of the country . (BT claims that, by July, 99.8% of its exchanges will be broadband enabled, with alternative plans in place for even the most remote exchanges). "This is the enabler," Poulton says.

Yet while hroadband has come down in price too, those service providers targeting the business market warn against consumer servicesmasquerading(伪装) as business-friendly broadband.

"Broadband is available for as little as £15 a month, but many businesses fail to appreciate the hidden costs of such a service," says Neil Stephenson, sales and marketing director at Onyx Internet, an internet service provider based in the northeast of England. "Providers offering broadband for rock-bottom prices are notorious for poor service, with regular breakdowns and heavilycongested(拥堵的) networks. It is always advisable for businesses to look beyond the price tag and look for a business-only provider that can offer more reliability, with good support." Such services don't cost too much--quality services can be found for upwards of £30 a month.

The benefits of broadband to the occasional home worker are that they can access email in real time, and take full advantage of services such as internetbased backup or even internet-based phone services.

Internet-based telecoms, or VolP (Voice over IP), to give it its technical title, is an interesting tool to any business supporting remote working, not necessarily because of the promise of free or reduced price phone calls (which experts point out is misleading for the average business), but because of the sophisticated voice services that can be exploited by the remote worker—facilities such as voicemail and call forwarding, which provide a continuity of the company image for customers and business partners.

By law, companies must "consider seriously" requests to work flexibly made by a parent with a child under the age of six, or a disabled child under 18. It was the need to accommodate employees with young children that motivated accountancy firm Wright Vigar to begin promoting teleworking recently. The company, which needed to upgrade its ITinfrastructure(基础设施) to provide connectivity with a new, second office, decided to introduce support for remote working at the same time.

Marketing director Jack O'Hern explains that the company has a relatively young workforce, many of whom are parents: "One of the triggers was when one of our tax managers returned from maternity leave. She was intending to work part time, but could only manage one day a week in the office due to childcare. By offering her the ability to work from home, we have doubled her capacity—now she works a day a week from home, and a day in the office. This is great for her, and for us as we retain someone highly qualified."

For Wright Vigar, which has now equipped all of its fee-earners to be able to work at maximum productivity when away from the offices (whether that's from home, or while on the road), this strategy is not just about saving on commute time or cutting them loose from the office, but enabling them to work more flexible hours that fit around their home life.

O'Hern says: "Although most of our work is client-based and must fit around this, we can't see any reason why a parent can't be on hand to deal with something important at home, if they have the ability to complete a project later in the day."

Supporting this new way of working came with a price, though. Although the firm was updating its systems anyway, the company spent 10-15% more per user to equip them with a laptop rather than a PC, and about the same to upgrade to a server that would enable remote staff to connect to the company networks and access all their usual resources.

Although Wright Vigar hasn't yet quantified the business benefits, it claims that, in addition to being able to retain key staff with young families, it is able to save fee-earners a substantial amount of "dead" time in their working days.

That staff can do this without needing a fixed telephone line provides even more efficiency savings. "With Wi-Fi (fast, wireless internet connections) popping up all over the place, even on trains, our fee-earners can be productive as they travel, and between meetings, instead of having to kill time at the shops," he adds.

The company will also be able to avoid the expense of having to relocate staff to temporary offices for several weeks when it begins disruptive officerenovations(翻新) soon.

Financial recruitment specialist Lynne Hargreaves knows exactly how much her firm has saved by adopting a teleworking strategy, which has involved handing her company's data management over to a remote hosting company, Datanet, so it can be accessible by all the company's consultants over broadband internet connections.

It has enabled the company to dispense with its business premises altogether, following the realisation that it just didn't need them any more. "The main motivation behind adopting home working was to increase my own productivity, as a single mum to an 11-year-old," says Hargreaves. "But I soon realised that, as most of our business is done on the phone, email and at off-site meetings, we didn't need our offices at all. We're now saving £16,000 a year on rent, plus the cost of utilities, not to mention what would have been spent on commuting."

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第9题

—__doyougotoschool—__7()

A.When;In

B.How;At

C.When;At

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第10题

--__doyouhaveEnglishclass---IhaveEnglish__Tuesday()

A.When,on

B.Whattime,on

C.When,at

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