题目内容
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The practical scientist ______.
A．knows the value of what he will discover
B．is interested in the unknown
C．knows that the world exists
D．is a philosopher
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更多“The practical scientist ______…”相关的问题
A、one-gene-one-protein hypothesis
B、one-gene-one-polypeptide hypothesis
C、one-gene-one-amino acid hypothesis
D、one-gene-one-alpha-chain hypothesis
E、none of the above
Fowell O'Durr plc manufactures an industrial insect repellent Wingblitz. Standard data for budgeted monthly production of 1,000 litres is as follows. Material $ Chemical W – 700 litres 1,400 Chemical P – 400 litres 600 2,000 Material inventories are valued at standard price, and inventories for the month of June were as follows. Chemical W Chemical P litres litres 1 June 650 380 30 June 680 295 During June, 670 litres of Chemical W were purchased for $1,474 and 320 litres of Chemical P at a price of $1.60 per litre. 900 litres of repellent were produced in June. What is the direct materials yield variance for June?
A、$nil
B、$90 Adverse
C、$100 Adverse
D、$200 Adverse
A．Technical Progress.
B．Man's Distinguishing Characteristics.
C．Learning for Its Own Sake.
D．The Difference Between Science and Philosophy.
A．They won't lose their jobs.
B．They get time off to attend courses.
C．They can work at whatever interests them.
D．They can make their own decisions.
In the United States, there is some disagreement (to say the least) over the risks and benefits .of nuclear power. There can be no question that with our electrical power needs increasing rapidly, we cannot rely indefinitely on the earth's remaining fossil fuel supply. The question is, can we safely shift our reliance to nuclear fission power plants—considering the present state of our knowledge and technology？ The American public has, in the past few years, developed a rather strong consensus regarding this question. Nuclear power has fallen into disfavor. The risks seem too great, the reward too small—at least for the immediate future.
It is not likely that an explosion of the type produced by atomic bombs can occur in the kinds of nuclear reactors being used today. However, we still don't know how close we came to a major tragedy at Three Mile Island. A far greater tragedy occurred at a nuclear plant at Chernobyl, in the Soviet Union's Ukraine in 1986. The risks associated with nuclear power, however, are not always so spectacular. Some are of a far subtler nature. For example, radioactivity could be released into the environment from activities related to mining and processing nuclear fuel, from the transportation and recycling of the fuel and from storage of the radioactive wastes. We frequently hear of steam or gas leaks from the reactors themselves. ;And even the safest reactors normally leak small amounts of radiation into their immediate environment. (The problem with this is that there are no "safe" levels of radioactivity--only "acceptable" levels. )
We could probably greatly reduce the risks associated with nuclear power by simply exercising more care and common sense. There are numerous published accounts that attest to our carelessness, however. For example, it has been revealed that the Diablo Canyon nuclear power plant in California was built on an earthquake fault line. At the WNP-2 plant in Washington State, the concrete contained air bubbles and pockets of water as well as shields that had been incorrectly welded. In 1981, the Nuclear Regulatory Commission inspected forty-three plants that were under construction and rated seven "below average" and thirty-six "average". None were rated even "above average".
Completely apart from the possibility of accidents, there is the unsolved problem of what to do with the radioactive wastes generated in the course of normal nuclear plant reactions. The problem is a tough one since such wastes can only be rendered safe by the passage of time. The waste radioactivity is .generated in the fuel system of the reactors because only a part of the fuel is fissionable and, for technical reasons, not all of the fissionable elements are spent. Much of the spent fuel materials removed from the reactor can be reused. However, some of the radioactive fuel in the spent elements cannot be removed, and this material adds to the radioactive waste.
We have already generated over 10,000 tons of nuclear waste, with another 47,000 tons expected by 19951 Most of the waste is in the form. of fuel rods which are, for now, stored in baths filled with a solution of neutron-absorbing boric acid. The problem is that these are only temporary repositories and,' unless new space is found, existing plants must begin closing for lack of space. The rods can be reprocessed, but the technology could lead to the fuel for nuclear weapons.
The reprocessing also leaves "high-level liquid waste" that must be stored. The prevailing idea at the moment is to dry the liquid and mix it with molten glass that, when it hardens, can be stored in tanks. Suggestions range from burying it in the Antarctic to sending it into space.
Which of the following statements best expresses the main idea of the selection？
A．Numerous risks and problems have made nuclear power an unpopular energy source.
B．There are fewer risks associated with nuclear power than the public believes exists.
C．Explosions of the type produced by atomic bombs are unlikely.
D．The primary problem at nuclear power plants is structural defects.
For most of us, work is the central, dominating fact of life. We spend more than half our conscious hours at work, preparing for work, traveling to and from work. What we do there largely determines our standard of living and the status we are accorded to a considerable extent as well. It is sometimes said that because leisure has become more important the indignities and injustices of work can be pushed into a corner, that because most work is pretty intolerable, the people who do it should compensate for its boredom, frustrations and humiliations by concentrating their hopes in the other parts of their lives. I reject that as a counsel of despair. For the foreseeable future the material and psychological rewards which work can provide, and the conditions in which work is done, will continue to play a vital part in determining the satisfaction that life can offer. Yet only a small minority can control the pace at which they work or the conditions in which their work is done; only for a small minority does work offer scope for creativity, imagination, or initiative.
Inequality at work and in work is still one of the most cruel and most glaring forms of inequality in our society. We cannot hope to solve the more obvious problems of industrial life, many of which arise directly or indirectly from the frustrations created by inequality at work, unless we tackle it head-on. Still less can we hope to create a decent and hi, mane society.
The most glaring inequality is that between managers and the rest. For most managers, work is an opportunity and a challenge. Their jobs engage their interest and allow them to develop their abilities. They are constantly learning; they are able to exercise responsibility; they have a considerable degree of control over their own and others' working lives. Most important of all, they have opportunity to initiate. By contrast, for most manual workers, and for a growing number of white-collar workers, work is a boring, dull, even painful experience. They spend all their working lives in conditions which would be regarded as intolerable for themselves by those who make the decisions which let such conditions continue. The majority has little control over their work； it provides them with no opportunity for personal development. Often production is so designed that workers are simply part of the technology. In offices, many jobs are so routine that workers justifiably feel themselves to be mere cogs in the bureaucratic machine. As a direct consequence of their work experience, many workers feel alienated from their work and their firm, whether it is in public or in private ownership.
In the writer's opinion, people judge others by ______.
A．the type of work they do
B．the place where they work
C．the time they spend at work
D．the amount of money they earn
A．Leakage of untreated nuclear wastes.
B．Explosions.
C．Earthquakes.
D．Gas or steam leaks.
A．We have already generated over 10,000 tons of nuclear waste.
B．Radioactivity could be released into the environmental from activities related to mining and processing nuclear fuel.
C．Only a part of nuclear fuel is fissionable.
D．A location for stainless steel tanks containing "high-level liquid waste" mixed with molten glass has not been found.
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