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[主观题]

The promise of finding long term technological solutions to the problem of world food shor

tage seems difficult to fulfill. Many innovations that were once heavily supported and publicized, such as fish protein concentrate and protein from algae grown on petroleum substrates, have since fallen by the wayside. The proposals themselves were technically feasible but they proved to be economically unviable and to yield food products culturally unacceptable to their consumers.

One characteristic common to unsuccessful innovations has been that, even with extensive government support, they often have not been technologically adapted or culturally acceptable to the people for whom they had been developed. A successful new technology, therefore, must fit the entire social cultural system in which it is to find a place. Security of crop yield, practicality of storage, and costs are much more significant than had previously been realized by the advocates of new technologies.

The adoption of new food technologies depends on more than these technical and cultural considerations; economic factors and governmental policies also strongly influence the ultimate success of any innovation. Economists in the Anglo-American tradition have taken the lead in investigating the economies of technological innovation. Although they exaggerate in claiming that profitability-is the sky factor guiding technical change—they completely disregard the substantial effects of culture—they are correct in stressing the importance of profits. Most technological innovations in agriculture can be fully used only by large landowners and are only adopted if these profit-oriented business people believe that the innovation will increase their incomes. Thus, innovations that carry high rewards for big agribusiness (agricultural business) groups will be adopted even if they harm segments of the population and reduce the availability of food in a country. Further, should a new technology promise to alter substantially the profits and losses associated with any production system, those with economic power will strive to maintain and improve their own position. Since large segments of the populations of many developing countries are close to the subsistence margin and essentially powerless, they tend to be the losers in this system unless they are aided by a government policy that takes into account the needs of all sectors of the economy. Therefore, although technical advances in food production and processing will perhaps be needed to ensure food availability, meeting food needs will depend much more on equalizing economic power among the various segments of the population within the developing countries themselves.

Which of the following best describes the organization of the first paragraph?

A.a suggestion is made and arguments in its favor are provided.

B.a criticism is imposed and an alternative proposal is suggested.

C.a generalization is advanced and supporting evidence is provided.

D.an example is analyzed and general conclusions are derived from it.

提问人:网友jhonmary 发布时间:2022-01-06
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更多“The promise of finding long te…”相关的问题
第1题
【判断题】President James Polk set a declaration of war against Canada
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第2题
材料:

Intention can be inferred in many ways by the courts.Thus the discharge at Cadiz instead of Bombay“for nefarious reasons”was an unreasonable deviation.A transshipment was declared to be an unreasonable deviation “since no excuse has been proffered for the deviation.” A geographic deviation abrogated the contract because“there can be no suggestion that the deviation was other than voluntary.”

On the other hand,where the court was unable to find that a defendant&39;s action constituted“a voluntary deviation without reasonable cause,” the defendant was exculpated of liability.The vast majority of decisions require that intention be proved in cases of deviation and quasi-deviation.The carrier has the burden of proving that it had no intention to deviate or that the deviation was not for the carrier&39;s sole benefit.

Accordingly,a geographic deviation due to an erroneous change of course by the master is not a deviation,but an error in navigation;in such a case,the carrier is protected under the Rules.If,however,the master is ordered to alter the customary or planned route,or deliberately takes it upon himself to do so,for a reason other than to save persons or cargo(or some similar reason),then the course alteration is an unreasonable deviation,because it is intentional and for the carrier&39;s own benefit.

nefarious,邪恶的,穷凶极恶的

proffer,提出

abrogate,使作废

问题:

If the carrier has proved that he had no intention to deviate or that the deviation was not for his sole benefit ________.

A.he will be exculpated of liability

B.he is to investigate the case further

C.he will not be exculpated of liability

D.he has to contact with the shipper to see if he himself is free of any liability

A geographic deviation due to an erroneous change of course by the master ________.A.is not a reasonable deviation

B.is not an error in navigation

C.is a reasonable deviation

D.can not be determined if it constitutes a reasonable deviation

Where the court is unable to find that a defendant's action constituted “a voluntary deviation without reasonable cause,”________.A.the defendant will not be responsible for the loss and damage

B.the defendant will be responsible for the loss and damage

C.if the defendant be responsible for the loss and damage can not be determined

D.the court should not make any decision

An unreasonable deviation must be committed by the master ________.A.intentionally

B.for the carrier's own benefit

C.intentionally and for the carrier's own benefit

D.reasonably

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第3题
•Read the text about business-school.

•Choose the best word from below to fill each gap.

•For each question 21—30, mark one letter (A, B, C or D).

Hurtling as we are towards the new millennium, with all the social changes this iconic date implies, it is increasingly apparent (21) the world of business is experiencing fundamental shifts. Today, both companies and schools are increasingly aware that business is a human activity; it's ultimately (22) and about people.

In future, employers will (23) doubt demand more rounded individuals to run their operations, which naturally creates a question for the next generation of students, "Is the classic MBA still the model—and obligatory—passage toward that ideal career?"

The Masters of Business Administration (MBA), the best-known business school label, is an introduction to general management. The traditional MBA, Harvard-style, has remained largely unaltered (24) the 1950s, and seeks to provide a thorough knowledge of business functions through the case study—a(n) (25) incidentally borrowed from law school.

The trouble is that the real world is not a theoretical exercise. The problems managers face today are messy, and, if anything, are becoming messier, neither fitting in neat functional boxes nor (26) one simple answer. Ambiguity is the hardest (27) to manage, but it's the one most managers are wrestling with.

"Management is more art than science," observes Richard D'Aveni, professor of strategic management at Dartmouth's Amos Tuck School of Business Administration. "No one can say with certainty which decisions will bring the most (28) , any more than they can create instructions over (29) to sculpt a masterpiece. You just have to feel it as it goes."

John Quelch is another business-school insider who detects the limitations of the traditional syllabus. According to Quelch, leadership is an area that b-schools have not fully addressed. It is notoriously hard to teach, (30) programs do have the capacity to provide a grounding in non-business areas and personal growth.

(21)

A.which

B.that

C.how

D.why

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第4题
•Read the article below about problems in the IT industry, and the questions on the opposite page.

•For each question (13-18), mark one letter (A, B, C or D) on your Answer Sheet.

Problems in the IT industry

In the information technology industry, it is widely acknowledged that how well IT departments of the future can fulfil their business goals will depend not on the regular updating of technology, which is essential for them to do, but on how well they can hold on to the people skilled at manipulating the newest technology. This is becoming more difficult. Best estimates of the current shortfall In IT staff in the UK are between 30,000 and 50,000, and growing.

And there is no end to the problem in sight. A severe industry-wide lack of investment in training means the long-term skills base is both ageing and shrinking. Employers are chasing experienced staff in ever-decreasing circles, and, according to a recent government report, 250,000 new IT jobs will be created over the next decade.

Most employers are confining themselves to dealing with the immediate problems. There is little evidence, for example, that they are stepping up their intake of raw recruits for in* house training, or retraining existing staff from other functions. This is the course of action recommended by the Computer Software Services Association, but research shows its members are adopting the short-term measure of bringing in more and more consultants on a contract basis. However, this approach is becoming less and less acceptable as the general shortage of skills, coupled with high demand, sends contractor rates soaring. An experienced contract programmer, for example, can now earn at least double the current permanent salary.

With IT professionals increasingly attracted to the financial rewards and flexibility of consultancy work, average staff turnover rates are estimated to be around 15%. While many companies in the financial services sector are managing to contain their losses by offering skilled IT stall 'golden handcuffs' - deferred loyalty bonuses that tie them in until a certain date - other organisations, like local governments, are unable to match the competitive salaries and perks on offer in the private sector and contractor market, and are suffering turnover rates of up to 60% a year.

But while loyalty bonuses have grabbed the headlines, there are other means of holding on to staff. Some companies are doing additional IT pay reviews in the year and paying market premiums. But such measures can create serious employee relations problems among those excluded, both within and outside IT departments. Many Industry experts advise employers to link bonuses to performance wherever possible. However, employers are realising that bonuses will only succeed if they are accompanied by other incentives such as attractive career prospects, training, and challenging work that meets the individual's long-term ambitions.

This means managers need to allocate assignments more strategically and think about advancing their staff as well as their business. Some employers advocate giving key employees projects that would normally be handled by people with slightly more experience or capability. For many employers, however, the urgency of the problem demands a more immediate solution, such as recruiting skilled workers from overseas. But even this is not easy, with strict quotas on the number of work permits issued. In addition, opposition to the recruitment of IT people from other countries is growing, as many professionals believe it will lead to

A.their success at retaining their skilled staff.

B.the extent to which they invest in new technology.

C.their attempts to recruit staff with the necessary skills.

D.the ability of employees to keep up with the latest developments.

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第5题

PROBLEMS 1-1 A floating zone is passed up the length of an aluminum single crystal with 7.5px radius. Thermal conductivity of molten aluminum is approximately 0.20 cal/(cm)(℃)(s). Coefficient of heat transfer between aluminum and the furnace atmosphere h is 1.2×cal/()(℃)(s). Other data are given in Appendix B. (a) What is the maximum temperature gradient achievable at the liquid-solid interface in the solid? In the liquid? (b) Would these temperature gradients be significantly different at a typical crystal-growing velocity of 5×cm/s? (c) How might you alter the crystal or crystal-growing apparatus to increase these gradients? 1-2 Plot the longitudinal temperature profile during solidification of the single crystal of Example 1(b). 1-3 A large slab of aluminum, 25 cm thick, is poured in a sand mold with no superheat. (a) How long will it take for the slab to solidify? (Assume negligible resistance to heat flow at the mold-metal interface and within the solidified metal.) (b) Show schematically cooling curves for a thermocouple 6.25 cm from the surface and one at the center of the casting. (Remember, the solidified portion of the casting remains very close tountil the casting is completely solid. ) 1-4 An approximate method of calculation of solidification time of a sand casting poured with superheat is to add the heat content associated with the superheat to the heat of fusion. How long would it take the slab casting of Prob. 1-3 to solidify if it were poured with 100℃ superheat? 1-5 Experimentally, it is found that when a casting such as that of Prob. 1-4 is cast, no significant solidification takes place until the superheat is completely dissipated. Explain. 1-6 A long cylinder of aluminum, 25 cm diameter, is poured with no superheat in a sand mold. (a) Calculate solidification time neglecting divergency of heat flow. (b) Calculate solidification time taking account of divergency of heat flow. (c) Derive an equation describing thickness of solid as a function of time during solidification of this cylinder. Neglect divergency of heat flow. Plot the result schematically. (d) You should find from (c) above that solidification rate is infinite at the beginning and end of solidification. Explain the physical reason for this. 1-7 Is the error involved in using the Chvorinov approximation for solidification times greater for a sphere or for a cylinder of the same radius? For large castings or small? For metals of high or low melting point? 1-8 Aluminum is splat-cooled on a copper substrate with a mold-metal-interface heat-transfer coefficient of 1 cal/()(℃)(s). (a) Assuming heat transfer is interface-controlled, how thin must the sample be to achieve a cooling rate (in the liquid at just above the melting point) of℃/s? (b) For the thickness calculated above, is it reasonable to assume interface-controlled heat transfer? 1-9 One of the advantages claimed for magnesium die casting compared with aluminum is a shorter solidification time. Show that this is true for processes where heat transfer is controlled at the mold-metal interface. 1-10 (a) A slab of iron, 25 cm thick, is poured with no superheat into an iron mold. Calculate the solidification time assuming no mold-metal resistance to heat flow. (b)How much longer is required for solidification of the slab in a sand mold? Neglect resistance to heat flow within the solidified metal and at the mold-metal interface. (c)What percentage error did you introduce in (b) by neglecting resistance to heat flow within the solidified metal? 1-11 What is the mold-metal interface temperature for the iron slab poured in the metal mold of Prob. 1-10. In the sand mold? 1-12 Show that the mold-metal-interface temperature for iron poured at its melting point in an aluminum mold is below the melting point of aluminum. Why is aluminum seldom used as a mold material for iron? 1-13 For subsequent use in abrasive applications, aluminum oxide is melted and cast in ingot form in heavy iron molds. What is the solidification time of a slab of aluminum oxide 25 cm thick? Does the mold-metal interface temperature stay below the melting point of iron? Approximate thermal properties of the aluminum oxide are= 2320℃, Ks = 0.013cal/(cm oC s), ρs = 3.6,= 0.33 cal/g K, H=280cal/g. 1-14 You are to help design a vertical continuous-casting machine to make 8-in-thick low-carbon steel slabs. Casting speed to be aimed for is 100 in/min. What is the minimum-height casting tower you must plan to build? Note: Heat flow in the longitudinal direction can be neglected. You can obtain the answer to this problem analytically by using data for pure iron or, more simply, by using Fig. 1-l 3. 1-15 What thermal properties of a mold material affect its heat, absorbing ability, i. e., the rate at which an infinitely thick mold can extract heat? Rate quantitatively the mold materials sand, plaster, aluminum, iron, and copper.

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第6题
An indivisible project is a project that must be undertaken completely or not at all.
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