考研每日一练（2019/4/4）

第1题：设随机变量(X，Y)的概率密度为 求(Ⅰ)常数k的值； (Ⅱ)(X，y)的边缘密度fx(x)和fY(y)； (Ⅲ)条件密度fY|X(y|x)和fX|Y(x|y)； (Ⅳ)PX+Y≤1的值．

【分析题】：

第2题：下列说法正确的是______。 A．任何有向网络AOV网)拓扑排序的结果是唯一的 B．有回路的图不能进行拓扑排序 C．在AOE网中一定只有一条关键路径 D．一个正常的AOE网中只能有一个源点、一小汇点和一条关键路径

【单选题】： A     B     C     D

第3题：In the end, a degree of sanity prevaileD、 The militant Hindus who had vowed to breach a police cordon and start the work of building a temple to the god Ram at the disputed site ofAyodhya decided to respect a SupremeCourt decision barring them from the are A、So charged have Hindu-Muslim relations in India become in recent weeks, as the declared deadline of March 15th neared, that a clash at Ram’s supposed birthplace might well have provoked bloodshed on an appalling scale across the nation. It has, unfortunately, happened often enough before. But the threat has not vanisheD、The court’s decision is only an interim one, and the main Hindu groups have not given up on their quest to build their temple.Extreme religious violence, which seemed in recent years to have faded after theAyodhya related explosion of 1992 1993, is again a feature of the political landscape. Though faults lie on both sides (it was a Muslim attack on Hindus in a train in Gujarat that started the recent slaughter), the great bulk of victims were, as always, Muslims. Once again, educated Hindus are to be heard inveighing against the "appeasing" of Muslims through such concessions as separate constitutional status for Kashmir or the right to practice Islamic civil law. Once again, the police are being accused of doing little or nothing to help Muslim victims of rampaging Hindu mobs. Once again, India’s 130m Muslims feel unequal and unsafe in their own country. Far too many Hindus would refuse to accept that it is "their own country" at all. The wonder of it, perhaps, is that things are not worse. While the world applauds Pakistan for at last locking up the leaders of its extreme religious groups, in India the zealots still support, sustain and to a degree constitute the government. TheBJP, which leads the ruling coalition, was founded as a political front for the Hindu movement. It is simply one, and by no means the dominant, member of what is called the Sangh Pariwar, the "family of organizations". Other members of the family are much less savoury. There is the VHO, the World Hindu Organization, which led the movement to build the Ram temple. There is theBajrangDal, the brutalist "youth wing" of the VHO. There is substantial evidence that members of the VHO and theBajrangDal helped to organize the slaughter of hundreds of Muslims in Gujarat after 58 Hindus were killed on a train as they returned fromAyodhy A、 What does the writer wants to illustrate with "a Muslim attack on Hindus on a train in Gujarat" A、The violation of a SupremeCourt decision. B、Frequent clashes between Hindus and Muslims. C、The brutality of extreme Indian policemen. D、Social privileges entitled to Hindus mobs.

【单选题】： A     B     C     D

第4题：

【分析题】：

第5题： 关于疾病负担测量，下列说法不正确的是 A．DALY与PYLL计算方法相近 B．PYLL可综合估计导致某人群早死的各种死因的相对重要性 C．PYLL计算中考虑到死亡发生的年龄因素 D．PYLL用来衡量死亡所造成的寿命损失 E．DALY可用于成本效果分析

【单选题】： A     B     C     D     E

第6题：地龙的功效是 A．熄风、平喘、祛风湿 B．熄风、利尿、退黄疸 C．熄风、利尿、退虚热 D．熄风、安神、平喘咳 E．熄风、平喘、通经络

【单选题】： A     B     C     D     E

第7题： 甲向乙借款，将自己的电脑出质于乙。乙因不会用电脑，让甲将该电脑拿回自用。后甲某又向丙借款，将该电脑出质给了丙，丙对该电脑实际占有。现因甲无力还款引起纠纷。乙和丙均欲行使对该电脑的质权。下列表述中正确的是（ ） A．甲与乙之间的质押合同生效 B．甲与乙的质押合同不生效 C．乙对抗丙的质权不受法律保护 D．乙对抗丙的质权受到法律保护

【单选题】： A     B     C     D

第8题： 管理幅度是指所直接管辖人数的多少，一般而言，______可以使管理幅度增加。 A．下属的工作内容有较大差异性 B．组织信息化程度提高 C．下属的能力较差 D．组织所面临的环境变化较快

【单选题】： A     B     C     D

第9题： The mechanic address from the retired brigadier's wife is an example of______ A．response matching B．speech convergence C．speech divergence D．need for equilibrium

【单选题】： A     B     C     D

第10题：In 2007 a French food company wanted to buy a family-owned firm in Indi A、The patriarch was 72, and the French firm wanted to send someone of similar experience to talk to him.But because of its youthful corporate culture-most people are hustled out of the door in their mid 40s-it had no one to senD、In the end, throughExperconnect, an employment agency in Paris which places retired people, it found a 58-year-old former head of aEuropean consumer-goods firm, and sent him out to Mumbai. France has a poor record when it comes to keeping older people in the workforce. The retirement age is 60, not 65 as in most developed countries. In 2005 only 37.8% of people aged 55-64 had jobs, versus 56.8% inBritain and 44.9% in Germany. The main reason is that in the 1980s, when there was high unemployment, the government promoted early retirement. That entrenched the idea that older workers were less productive, saysCaroline Young,Experconnect’s founder. Now companies are worried about losing their most skilled workers, especially as the baby boom generation nears retirement.Areva, a nuclear-power group, recently launched a scheme to address the needs of older employees, and plans to use about 100 retired people a year throughExperconnect.Because nuclear power was unpopular for decades,Areva stopped training engineers, so that much of its expertise lies with its oldest staff. Now it is taking much more interest in them. "We have to bring about a revolution in opinion," says JeanCassingena, its human-resources strategist. Unlike other recruitment agencies,Experconnect keeps its workers on its own books, so they can carry on drawing their pensions. They tend to work part-time on one-off projects.Engineers and people with high levels of technical skill are most in demand in France, says Ms Young, as younger people increasingly choose to go into fields such as marketing. Thales, a defence and aerospace firm, is using a former radar expert, for instance, and LouisBerger France, an engineering firm, often uses retired engineers to manage big infrastructure projects. Softer industries also make use ofExperconnect.Danone, a food firm, hires people for one-off management roles. "Older people have seen it all and they are level-headed," says Thomas Kunz, its head of beverages. The beauty industry is short of toxicologists to determine whether new lotions are safe, and one firm has just taken on a 75-year-olD、Two famous French luxury-goods companies plan to use retired workers in their handbag divisions. One wants to safeguard its knowledge of fine leathers and sewing; the other wants to apply expertise from the aerospace industry to make new kinds of materials for handbags. Despite an impressive handful of high-profile clients,Experconnect has found it difficult to convince French companies that older workers can be valuable. It has 2,700 retired people on its books, and has so far placed just 50 of them on "missions". Old prejudices, as they say, die harD、 What feature doesExperconnect boast different from other recruitment agencies A、Providing better job opportunities for the experienced workers. B、Having a professional management system of manpower. C．Keeping the management of the workers in its own books so that old workers can still enjoy their pensions. D．Specialising in engineers and people with high levels of technical skill.

【单选题】： A     B     C     D