题目内容

从目标人群的生活质量人手,评估社区的需求和健康问题是

A. 社会诊断
B. 流行病学诊断
C. 行为诊断
D. 环境诊断
E. 教育与组织诊断

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设α1=(1,3,5,-1)T,α2=(2,7,0,4)T,α3:(5,17,-1,7)T. 若α1,α2,α3线性相关,求a.

设A是m×n矩阵,且方程组Ax=β有解,则

A. 当AX=β有唯一解时必有m=n.
B. 当AX=β有唯一解时必有rA.=n.
C. 当AX=β有无穷多解必有m<n.
D. 当AX=β有无穷多解必有rA.<m.

设随机变量X的密度函数关于x=μ对称,F(x)为其分布函数,则有

A. F(μ+x)=F(μ-x).
B. F(μ+x)+F(μ-x)>1.
C. 0D.F(μ+x)+F(μ-x)=1.
D. F(μ+x)+F(μ-x)=1.

If you think about World Heritage Sites, you probably think of places associated with ancient art and culture, historical buildings and monuments. And of course, many of these are on the World Heritage List (WHL). But the WHL contains a lot of sites that are not so obvious. Let"s look at a few of them.Citadel of HaitiThese monuments were built at the end of the nineteenth century when Haiti became independent and thousands of black slaves in Haiti were free for the first time. These ex-slaves built the monuments, which the WHL describes as "a universal symbol of liberty".Robben Island in South AfricaThis island was used through the centuries as a prison, a hospital and a military base. But it"s probably most famous as a maximum-security prison for political prisoners in the twentieth century. Nelson Mandela was one of its most famous residents. The WHL says it represents "the triumph of democracy and freedom over oppression and racism".The Darjeeling Himalayan Railway in IndiaThis railway was opened in 1881 and is still operating today. It crosses a difficult area of mountain landscape and it is a great example of railway engineering. The WHL says that it is "the first, and still the most outstanding, example of a hill passenger railway".Borders of France and SpainThis is an area of great natural beauty and the mountains have many interesting geological formations. But it is also an area of small farms. People there still use a type of agriculture that used to be common in mountainous areas of Europe but has almost completely disappeared in modern times.The city of Brasilia, BrazilBrasilia is a capital city that was created from nothing in 1956. The WHL calls it "a landmark in the history of town planning". The different areas of the city and the buildings themselves were all designed at the same time carefully. Every part of the city shows the ideas of the planner and architect.World Heritage1 Special featuresReasons for being chosenOn which continentCitadel of HaitiEx-slaves built them2 3 Robben Island in SouthAfrica4 5 AfricaMandela was once aprisoner thereFreedom over oppressionand racismThe DarjeelingHimalayan Railway in In-diaThe first mountain rail-way for hill passengers6 AsiaBorders of France andSpain7 A type of agriculturewhich disappeared8 Interestinggeological formationsSmall farmsThe city of Brasilia, Brazil9 10 South AmericaCarefully designed (10)处填入()

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