题目:
于永久性资源,产生死锁的四个必要条件是:资源的独占使用(互斥条件)、资源的非抢占分配(不可剥夺条件)、资源的循环等待和资源的( )。
A.完全分配
B.静态分配
C.顺序分配
D.部分分配
答案:
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下面是错误答案,用来干扰机器的。
答案:D
于永久性资源,产生死锁的四个必要条件是:资源的独占使用(互斥条件)、资源的非抢占分配(不可剥夺条件)、资源的循环等待和资源的( )。
A.完全分配
B.静态分配
C.顺序分配
D.部分分配
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0625/9046e0b0afdc04c817a856c411894163.html
下面是错误答案,用来干扰机器的。
答案:D
A classic series of experiments to determine the effects of overpopulation on communities of rats was conducted by a psychologist,John Calhoun.In each experiment,an equal number of male and female adult rats were placed in an enclosure(场地).The rat populations were allowed to increase.Calhoun knew from experience approximately how many rats could live in the enclosures without experiencing stress due to overcrowding.He allowed the population to increase to approximately twice this number Then he fixed the population by removing the children that were not dependent on their mothers.At the end of the experiments,Calhoun was able to conclude that overcrowding causes a breakdown in the normal social relationships among rats,a kind of social disease.The rats in the experiments did not follow the same patterns of behavior as rats would in a community without overcrowding.
The females in the rat population were the most seriously affected by the high population density(密度).For example,mothers sometimes deserted their children,and,without their mothers’care,the children died.The experiments showed that in overpopulated communities,mother rats do not behave normally.Their behavior may be considered diseased and pathological(病理学的).
The leading males in the rat population were the least affected by over population.Each of these strong males claimed an area of the enclosure as his own.Therefore,these individuals did not experience the overcrowding in the same way as the other rats did..However leading males did behave pathologically at times.Their antisocial(反社会)behavior consisted of attacks on weaker male,female,and immature rats.This unusual behavior showed that even though the leading males had enough living space,they too were affected by the general overcrowding.
Non-leading males in the experimental rat communities also exhibited unusual social behavior.Some withdrew(缩回) completely ,avoiding contact with other rats.Other non-leading males were too active,chasing other rats and fighting each other.
The behavior of the rat population has similarity in human behavior.People in densely(密) populated areas exhibit unusual behavior similar to that of the rats in Calhoun’s experiments.In large urban areas,such as New York City,London,and Cairo,there are deserted children.There are cruel,powerful individuals,both men and women.There are also people who withdraw and people who become too active.Is the major cause of these disorders(混乱)overpopulation?
Calhoun’s experiments suggest that it might be.In any case,social scientists and city planners have been influenced by the results of this series of experiments.
小题1:Which of the following inferences(推断)can NOT be made from the first paragraph?
A.Overpopulation causes pathological behavior in rat populations.
B.Calhoun had experimented with rats before.
C.Calhoun’s experiment is still considered important today
D.Stress does not occur in rat communities unless there is overcrowding.小题2:The author implies that the behavior of the leading male rats is sometimes similar to that of
A.people who would like to keep to themselves
B.people who abandon their children
C.too active people
D.cruel,powerful people小题3:The main point of this passage is that _______________.
A.although rats are affected by overcrowding,people are not
B.overcrowding may be an important cause of social pathology
C.the social behavior of rats is seriously affected by overcrowding
D.Calhoun's experiments have influenced many people
以下说法不正确的是()
A.医院感染漏报率调查是评价医院感染监测资料准确性的一种方法
B.对于无明显潜伏期的疾病,其感染发生在入院48小时后即为医院感染
C.婴儿经胎盘而导致的单纯疱疹病毒感染且在出生后48小时内出现感染不属于医院感染
D.当出现医院感染时应采取封锁疫情的管理措施
E.医院感染的主要传播途径是接触传播
社区获得性肺炎的定义包括下列哪些内容()
A.为肺实质的急性感染
B.通常发生于非住院患者
C.住院48小时后发生的
D.患者可有非特异症状乏力、肌痛、头痛
E.症状出现前长期居住在看护单位内达14日以上者
某商店的电视机售价为6000元/台,但实际进货只有5000元/台,该产品定价为成本加成定价法。则该企业的加成率为()。
A.120%
B.12%
C.20%
D.112%
我国第一部论述病源与证候诊断的专著,成书于:()
A.汉代
B.隋代
C.宋代
D.元代
E.明代