Most of the world’s victims of AIDS live —

题型:问答题

问题:

Most of the world’s victims of AIDS live — and, at an alarming rate, die — in Africa. The number of people living with AIDS in Africa was estimated at 26.6 million in late 2003. New figures to be published by the United Nations Joint Program on AIDS (UNAIDS), the special UN agency set up to deal with the pandemic, will probably confirm its continued spread in Africa, but they will also show whether the rate of spread is constant, increasing or falling.
AIDS is most prevalent in Eastern and Southern Africa, with South Africa, Zimbabwe and Kenya having the greatest numbers of sufferers; other countries severely affected include Botswana and Zambia. AIDS was raging in Eastern Africa — where it was called "slim", after the appearance of victims wasting away — within a few years after its emergence was established in the world in 1981. One theory of the origin of the virus and syndrome suggests that they started in the eastern Congo basin; however, the conflicting theories about the origin of AIDS are highly controversial and politicized, and the controversy is far from being settled.
Measures being taken all over Africa include, first of all, campaigns of public awareness and device, including advice to remain faithful to one sexual partner and to use condoms. The latter advice is widely ignored or resisted owing to natural and cultural aversion to condoms and to Christian and Muslim teaching, which places emphasis instead on self-restraint.
An important part of anti-AIDS campaigns, whether organized by governments, nongovernmental organizations or both, is the extension of voluntary counseling and testing (VCT). In addition, medical research has found a way to help sufferers, though not to cure them.
Funds for anti-AIDS efforts are provided by the Global Fund to Fight AIDS, Tuberculosis and Malaria, a partnership between governments, civil society, the private sector and affected communities around the world; the fund was launched following a call by the UN Secretary-General in 2001. However, much more is needed if the spread of the pandemic is to be at least halted.

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题型:问答题

牙周菌斑中的细菌主要通过以下方式破坏牙周组织,除外()

A.直接侵入牙周组织

B.产生各种酶破坏细胞间质

C.产生抗原,激活宿主的免疫反应

D.产生内毒素,激活宿主的炎症反应

E.产生代谢产物直接毒害组织细月

题型:问答题

(1)(5分)关于原子核的结合能,下列说法正确的是       (填正确答案标号。选

对I个得2分,选对2个得4分,选对3个得5分;每选错1个扣3分,最低得分为0分)。

A.原子核的结合能等于使其完全分解成自由核子所需的最小能量

B.一重原子核衰变成α粒子和另一原子核,衰变产物的结合能之和一定大于原来重核的结合能

C.铯原子核()的结合能小于铅原子核()的结合能

D.比结合能越大,原子核越不稳定

E.自由核子组成原子核时,其质量亏损所对应的能量大于该原子核的结合能

(2)(10分)如图,光滑水平直轨道上有三个质童均为m的物块A、B、C。 B的左侧固定一轻弹簧(弹簧左侧的挡板质最不计).设A以速度v0朝B运动,压缩弹簧;当A、 B速度相等时,B与C恰好相碰并粘接在一起,然后继续运动。假设B和C碰撞过程时间极短。求从A开始压缩弹簧直至与弹黄分离的过程中,

(ⅰ)整个系统损失的机械能;

(ⅱ)弹簧被压缩到最短时的弹性势能。

题型:问答题

患者,男,41岁,左上后牙缺失5个月,要求固定义齿修复,检查,缺失,邻面深龋,余留牙正常最适合的治疗方案()

A.种植固定桥

B.固定可摘联合桥

C.桩核与双端固定桥

D.覆盖义齿

E.以上都不是

题型:问答题

若有char ch[10],则下列字符串数组的赋值中不正确的是( )。

A.ch="welcome";

B.ch[0]='w';

C.strcpy(ch,"welcome");

D.char ch1[]="welcome";strcpy(ch,ch1);

题型:问答题

胸膜腔 ( )

A.是密闭的潜在性腔隙

B.其内压等于大气压

C.左、右胸膜腔相通

D.由壁胸膜相移行围成

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