更多“所谓需求，是指消费者对于某个具体产品的购买欲望。”相关的问题
颅内压增高患者禁用的检查方法是（）
A.颅脑X线片 B.颅脑CT C.颅脑MRI D.脑血管造影 E.腰椎穿刺
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建立现代企业制度是我国国有企业改革的方向，现代企业制度的基本特征是( )。
A．自主经营、自负盈亏、自我发展、自我约束
B．产权清晰、权责明确、政企分开、管理科学
C．政企分开、宏观管理、微观放开
D．面向市场、自由经营、自由发展
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“一些人说燃烧排放二氧化炭等工业温室气体是自古以来就存在的事情。我认为现在这个问题有着迫在眉睫的重大危害性。首先,它损害了大气的臭氧层,使人类直接承受太阳紫外线的伤害,导致疾病甚至基因变异。其次,它可能改变人类生存的空间。地球变暖,冰雪融化,海平面上升,许多岛国和沿海低地地区将被淹没。而且,它导致资源短缺。温度变化引起了气候反常,它可以产生反常的洪水或者干旱,导致农业的歉收。”下面两段话在上文中是什么关系?()I. 现在这个问题有着迫在眉睫的重大危害性;II. 它导致资源短缺。
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下列中不具气道扩张作用的药物是()
A . A．氟烷
B . B．N0
C . C．吗啡
D . D．雾化利多卡因
E . E．阿托品
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患者男，32岁，咳嗽1个月余，伴低热、痰中带血10天，胸片示：右肺上叶尖段炎症伴有空洞形成。最可能的诊断是（）。
A.肺脓肿
B.继发性肺结核
C.支气管扩张
D.癌性空洞伴感染
E.金黄色葡萄球菌肺炎
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教学模式设计的步骤主要包括()
A、设计教学结构B、设计预期教学目标C、设计教学方法D、设计对教学结果的测量与评价此题为多项选择题。
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求解选择问题时，全部元素分成5组，并选择各组的中位数中的中位数作为m，（）可以得到T（n）。
A.O（1）
B.O（logn）
C.O（n logn）
D.O（n）
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This passage is mainly about ______.
A．a survey of new approaches to artB．a review of Futurist poetryC．about the merits of Futurist poetryD．about laws and requirements of literature
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下列有关人格障碍的叙述，不正确的是（）
A.通常始于成年以后
B.指明显偏离正常且根深蒂固的行为方式
C.可能是精神疾病发生的素质因素之一
D.一般持续终生
E.评判标准来自于社会的一般准则
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Text 4The widely held assumption that people would volunteer for AIDS-tests in droves (成群结队) once treatment became available was wrong. And the reason for that appears to be that the government has not managed to reduce the stigma (耻辱) associated with AIDS, and thus with seeking out a test for it if you suspect you might be infected.To combat this, the whole basis of AIDS testing in Botswana has just been changed. The idea is to “downgrade” the process into something low-key, routine and stigma-free. Until now, a potential test subject had to opt in, by asking for a test. Having asked, he was given 40 minutes of counseling to make sure he really knew what he was doing before any test was carried out. The new policy is to test people routinely when they visit the doctor. That way, having a test cannot be seen as an indication that an individual believes he may be infected. The test is not compulsory, but objectors must actively opt out. Silence is assumed to be consent, and no counseling is offered—just as would be the case for any other infectious disease.This policy shift is probably just the first of many that will take place in Botswana, South Africa and other African countries that are planning the mass provision of anti-AIDS drugs in public hospitals. Dwain Ndwapi, a doctor at Botswana‘s largest AIDS clinic, thinks that there are circumstances in which testing should be compulsory. In particular, he believes that the currently high rate of transmission from mothers to new-born children could be reduced to zero if expectant mothers were always tested—and if those who proved positive were treated with an appropriate anti-retroviral (逆转录病毒) before they gave birth.Another controversial change in the air is to reduce the frequency of two costly tests of patients‘ blood. Viral-load (病毒载量) tests and CD4-cell counts both measure how acute an individual‘s infection has become. That helps a patient‘s doctor to decide when to prescribe anti-retroviral. But laboratory capacity in Africa is inadequate for regular testing of the millions of people that need such drugs—at least if the tests are carried out as frequently as they would be in a rich country. Less frequent testing of each individual would allow more individuals to be given at least some tests.But that must be balanced against the need to treat more people faster. Doctors in Botswana are staggered at how desperately sick many patients are when they first arrive. They had expected people to walk into clinics for AIDS tests. Instead, many come in on stretchers on the verge of death. Treating the very ill takes much more time and money than giving anti-AIDS pills to relatively healthy people, and it means that these people may have been inadvertently infecting others for longer. If routine tests persuade more patients to get help before they slump on a stretcher, all the better.
Text 4
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晶体管稳压电路如图所示，图中ui是输入电压，它在一定范围内变化，uo是输出电压，输出电压的稳压值由分压电阻R1、R2和稳压二极管VD的参数决定。试分别说明输入电压和负载电阻发生变化时，晶体管稳压电路的稳压过程和工作原理。
晶体管稳压电路如图所示，图中ui是输入电压，它在一定范围内变化，uo是输出电压，输出电压的稳压值由分压电阻R1、R2和稳压二极管VD的参数决定。试分别说明输入电压和负载电阻发生变化时，晶体管稳压电路的稳压过程和工作原理。
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钢结构设计时，碳素结构钢设计计算取值的依据是（）
A、σp
B、σs
C、σb
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同一材料中表面波声速近似于横波声速的9／10倍。
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引种中的技术措施（）。
A、引种结合选择
B、选择多种立地类型作试验
C、配合引种进行有性杂交
D、采用适宜的栽培技术措施
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