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局域网中使用的传输介质有双绞线、同轴电缆和光纤等。10BASE-T采用3类UTP，规定从收发端到有源集线器的距离不超过 (44) m。100BASE-TX把数据传输速率提高了10倍，同时网络的覆盖范围 (45) 。假设tPHY表示工作站的物理层时延，c表示光速，s表示网段长度，tR表示中继器的时延，在IOBASE-5最大配置的情况下，冲突时槽约等于 (46) 。光纤分为单模光纤和多模光纤，与多模光纤相比，单模光纤的主要特点是 (47) ，为了充分利用其容量，可使用 (48) 技术同时传输多路信号。
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Write an essay in no tess than 200 words with the title "What Can I Offer to Sciety" First, write an outline for your essay, and then according to your outline, write your essay. Both your outline and your essay should be written clearLy on your ANSWER SHEET.
2007年10月16日15时20分，C市地铁1号线B站工段施工工地(露天开挖作业)发生地面塌陷事故，造成长约100m、宽约50m的正在施工区域塌陷，施工现场西侧路基下陷达6m左右，将施工挡士墙全部推垮，自来水管、排污管断裂，大量污水涌出，同时东侧河水及淤泥向施工塌陷地点溃泻，导致施工塌陷区域逐渐被泥水淹没。事故造成在此处行驶的11辆汽车下沉陷落(车上员2人轻伤，其余人员安全脱险)，施工人员17人死亡、4人失踪。经抢险人员全力搜救，未发现生还人员。据初步调查，C市地铁1号线B站工段建设单位为A地铁集团有公司，设计单位为C城建设计研究总院，施工单位为中国中铁股份有限公司中铁某分局，监理单位为D工程项目监理咨询有限公司。 根据以上场景，回答下列问题： 特别重大事故的事故调查组的职责有( )。
2 Large, multinational corporations may be the companies whose ups and downs seize headlines. But to a far greater extent than most Americans realize, the economy’s vitality depends on the fortunes of tiny shops and restaurants, neighborhood services and facto- ries. Small businesses, defined as those with fewer than 100 workers, now employ nearly 60 percent of the work force and are expected to generate half of all new jobs between now and the year 2000. Some 1.2 million small firms have opened their doors over the past six years of economic growth, and 1989 will see an additional 200,000 entrepreneurs striking off on their own. Too many of these pioneers, however, will blaze ahead unprepared. Idealists will overestimate the clamor for their products or fail to factor in the competition. Nearly every one will underestimate, often fatally, the capital that success requires. Midcareer execu tives, forced by a takeover or a restructuring to quit the corporation and find another way to support themselves, may savor the idea of being their own boss but may forget that en trepreneurs must also, at least for a while, be bookkeeper and receptionist, too. According to Small Business Administration data, 24 of every 100 businesses starting out today are likely to have disappeared in two years, and 27 more will have shut their doors four years from now. By 1995, more than 60 of those 100 start-ups will have folded. A new study of 3,000 small businesses, sponsored by American Express and the National Federation of Independent Business, suggests slightly better odds: Three years after start-up, 77 percent of the companies surveyed were still alive. Most credited their success in large part to having picked a business they already were comfortable in. Eighty percent had worked with the same product or service in their last jobs. Thinking through an enterprise before the launch is obviously critical. But many entre- preneurs forget that a firm’s health in its infancy may be little indication of how well it will age. You must tenderly monitor its pulse. In their zeal to expand, small business owners often ignore early warning signs of a stagnant market or of decaying profitability. They hopefully pour more and more money into the enterprise, preferring not to acknowledge eroding profit margins that mean the market for their ingenious service or product has evaporated, or that they must cut the payroll or vacate their lavish offices. Only when the financial well runs dry do they see the seriousness of the illness, and by then the patient is usually too far gone to save. Frequent checks of your firm’s vital signs will also guide you to a sensible rate of growth. To snatch opportunity, you must spot the signals that it is time to conquer new markets, add products or perhaps franchise your hot idea. According to the passage, a country is probably decided by______.
Motorways are, no doubt the safest roads in Britain. Mile (21) mile, vehicle for ve hicle, you arc much (22) likely to be killed or seriously injured than on an ordinary road. On (23) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (24) than in a comparable accident (25) on the roads. Motorways have no (26) bends, no roundabouts or traffic lights and (27) speeds are much greater than on other roads. Though the 70 mph limit is (28) in force, it is of ten treated with the contempt that most drivers have for the 30 mph limit applying in built up areas in Britain. Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (29) ten meters between each vehicle. The resulting horrific pile-ups (30) one vehicle stops for some reason--mechanical failure, driver error and so on—have become all (31) familiar through pictures in newspapers or on television. How (32) of these drivers realize that it takes a car about one hundred meters to brake to a stop (33) 70 mph.9 Drivers also seem to think that motorway driving gives them complete protection from the changing weather. (34) wet the road, whatever the visibility in mist or fog, they (35) at ridiculous speeds oblivious of police warnings or speed restrictions (36) their journey comes to a conclusion. Perhaps one remedy (37) this motorway madness would be better driver educa tion. At present, learner drivers are barred (38) motorways and are thus as far as this kind of driving is (39) , thrown in at the deep end. However, much more efficient poli cing is required, (40) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness.
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