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OSI模型中物理层和数据链路层功能与TCP/IP模型中的(56)功能相同。以太网工作在TCP/IP模型的(57)。
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Fermented foods are free of contamination.
Some experimental evidence tends to show that alcohol reduces fear in an approach-avoidance situation. Conger trained one group of rats to approach a food goal and, using aversive conditioning, trained another group to avoid electric shock. After an injection of alcohol the pull away from the shock was measurably weaker, while the pull toward the food was unchanged.
The obvious troubles experienced by alcoholic persons appear to contradict the learning theory in the explanation of alcoholism. The discomfort, pain, and punishment they experience should presumably serve as a deterrent to drinking. The fact that alcoholic persons continue to drink in the face of family discord, loss of employment, illness, and other sequels of repeated bouts is explained by the proximity of the drive reduction to the consumption of alcohol; that is, alcohol has the immediate effect of reducing tension while the unpleasant consequences of drunken behavior. come only later. The learning paradigm, therefore, favors the establishment and repetition of the resort to alcohol.
In fact, the anxieties and feelings of guilt induced by the consequences of excessive alcohol ingestion may themselves become the signal for another bout of alcohol abuse. The way in which the clue for another bout could be the anxiety itself is explained by the process of stimulus generalization, conditions Or events occurring at the time of reinforcement tend to acquire the characteristics of stimuli. When alcohol is consumed in association with a state of anxiety or fear, the emotional state itself takes on the properties of a stimulus, thus triggering another drinking bout.
The role of punishment is becoming increasingly important in formulating a cause of alcoholism based on the principles of learning theory. While punishment may serve to suppress a response, experiments have shown that in some cases it can serve as a reward and reinforce the behavior. Thus if the alcoholic person has learned to drink under conditions of both reward and punishment, either type of condition may precipitate renewed drinking.
Ample experimental evidence supports the hypothesis that excessive alcohol consumption can be learned. By gradually increasing the concentration of alcohol in drinking water, psychologists have been able to induce the ingestion of larger amounts of alcohol by an animal than would be normally consumed. Other researchers have been able to achieve similar results by varying the schedule of reinforcement; that is, by requiring the animal to consume larger and larger amounts of the alcohol solutions before rewarding it. In this manner, animals learn to drink enough to become dependent on alcohol in terms of demonstrating withdrawal symptoms.
The author's primary purpose in the passage is to ______ .
What was taken some years ago as a ticket of certain admission to success is now being exposed to the scrutiny of cost-conscious employers who seek "can-dos" rather than "might-dos", and who feel that academia has not been sufficiently appreciative of the needs of industry or of the employers' possible contribution.
It is curious, given the name of the degree, that there should be no league table for UK business schools: no unanimity about what the degree should encompass; and no agreed system of accreditation. Surely there is something wrong. One wonders where all the tutors for this massive infusion of business expertise came from and why all this mushrooming took place.
Perhaps companies that made large investments would have been wiser to invest in already existing managers, perched anxiously on their own internal ladders. The Institute of Management's 1992 survey, which revealed that eighty-one per cent of managers thought they personally would be more effective if they received more training, suggests that this might be the case. There is, too, the fact that training alone does not make successful managers. They need the inherent qualifications. Of character; a degree of self-subjugation; and, above all, the ability to communicate and lead; more so now, when empowerment is a buzzword that is at least generating genuflexions, if not total conviction.
One can easily think of people, some comparatively unlettered, who are now lauded captains of industry. We may, therefore, not need to be too concerned about the fall in applications for business school places, or even the doubt about MBAs. The proliferation and subsequent questioning may have been an inevitable evolution. If the Management Charter Initiative, now exploring the introduction of a senior management qualification, is successful, there will be a powerful corrective.
We believe now that management is all about change. One hopes there will be some of that in relationship between management and science within industry, currently causing concern and which is overdue for attention. No one doubts that we need more scientists and innovation to give us an edge in an increasingly competitive world. If scientists feel themselves under-valued and under-used, working in industrial ghettos, that is not a promising augury for the future. It seems we have to resolve these misapprehensions between science and industry. Above all, we have to make sure that management is not itself smug about its status and that it does not issue mission statements about communication without realizing that the essence of it is a dialogue. More empowerment is required and we should strive to achieve it.
What is the writer's view in the reading passage？
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