具有了抽象的概念和一定的弹性，属于（）。

[单选题]Passage2Can electricity cause cancer？In a society that literally runs on electric power，the very idea seems preposterous.But for more than a decade，a growing band of scientists and journalists has pointed to studies that seem to link exposure to electromagnetic fields with increased risk of leukemia and other malignancies.The implications are unsettling，to say the least，since everyone comes into contact with such fields，which are generated by everything electrical，from power lines and antennas to personal computers and micro-wave ovens. Because evidence on the subject is inconclusive and often contradictory，it has been hard to decide whether concern about the health effects of electricity is legitimate-or the worst kind of paranoia.Now the alarmists have gained some qualified support from the U.S.Environmental Protection Agency. In the executive summary of a new scientific review，released in draft form late last week，the EPA has put forward what amounts to the most serious government warning to date.The agency tentatively concludes that scientific evidence"suggests a casual link”between extremely low-frequency electromagnetic fields-those having very long wave-lengths-and leukemia，lymphoma and brain cancer，While the report falls short of classifying ELF fields as probable carcinogens，it does identify the common 60-hertz magnetic field as"a possible，but not proven，cause of cancer in humans.”The report is no reason to panic-or even to lost sleep.If there is a cancer risk，it is a small one.The evidence is still so controversial that the draft stirred a great deal of debate within the Administration，and the EPA released it over strong objections from the Pentagon and the White House.But now no one can deny that the issue must be taken seriously and that much more research is needed.At the heart of the debate is a simple and well-understood physical phenomenon: When an electric current passes through a wire, it generates an electromagnetic field that exerts forces on surrounding objects. For many years, scientists dismissed any suggestion that such forces might be harmful, primarily because they are so extraordinarily weak. The ELF magnetic field generated by a video terminal measures only a few milligauss, or about one-hundredth the strength of the earth' sown magnetic field, the electric fields surrounding a power line can be as high as 10 kilovolts permeter, but the corresponding field induced in human cells will be only about 1 millivolt per meter. This is far less than the electric fields that the cells themselves generate.How could such minuscule forces pose a health danger? The consensus used to be that they could not, and for decades, scientists concentrated on more powerful kinds of radiation, like X-rays, that pack sufficient wallop to knock electrons out of the molecules that make up the human body. Such"ionizing"radiations have been clearly linked to increased cancer risks and there are regulations to control emissions.But epidemiological studies, which find statistical associations between sets of data, do not prove cause and effect. Though there is a body of laboratory work showing that exposure to ELF  fields can have biological effects on animal tissues,a mechanism by which those effects could lead to cancerous growths has never been found.The Pentagon is far from persuaded. In a blistering 33-page critique of the EPA report, Air Force scientists charge its authors with having "biased the entire document"toward proving a link. "Our reviewers are convinced that there is no suggestion that(electromagnetic fields) present in the environment induce or promote cancer,"the Air Force concludes."It is astonishing that the EPA would lend its imprimatur on this report."Then Pentagon's concern is understandable. There is hardly a unit of the modern military that does not depend on the heavy use of some kind of electronic equipment, from huge ground-based radar towers to the defense systems built into every warship and plane.It can be inferred from the physical phenomenon that_______.

[单选题]一串红属（）科花卉。

[问答题]根据JGJ/T77-2010，评价施工企业安全生产条件的量化指标是哪5个？

[多选题]预留印鉴应清晰、易辨别审核，预留时必须使用（）。

[填空题]休克早期患者的动脉压（），脉压（）。

[判断题]在应收款系统中制单方式指根据原始单据如何编制记账凭证，一般提供按客户、按单据、按汇总金额编制记账凭证。（　）

[单选题]关于锁骨下动脉或无名动脉狭窄引起椎动脉返流分为四级，以下哪一项是错误的（）。

[多选题]京菜的代表菜是（　　）。

[问答题]（六）　　【给定资料】　　据2010年6月25日中国政研会、中宣部政研所课题组调研结果：湖北英模“群星现象”是核心价值体系这片“良田沃土”上孕育出的“灿烂百花”，它从思想认识和工作方法等方面给予我们许多启示。　　湖北注重先进性要求与广泛性要求的有机统一，精心选择不同层次、不同类型的先进典型，全方位、多层次、立体化地展示湖北人民的整体形象，大大提高了典型的说服力和感染力；注重从平常生活中寻找感人故事，从平凡人物身上发现可贵精神，以平民的眼光和欣赏习惯来表现先进典型，使广大群众增强了对先进典型的认同感；强调以人为本，力避那种“高大全”式的典型和精神生活无欲、家庭生活无情、物质生活无求的非人性化倾向，做到所选典型可亲、可敬、可信、可学，体现人性特点、反映群众心声、得到群众认同。只有坚持贴近生活、贴近实际、贴近群众，夯实典型涌现的深厚民意基础，才能使学典型、追典型成为干部群众的自觉行动。　　湖北的典型宣传工作，力求把核心价值体系体现到新闻宣传的全过程，发挥各级各类媒体的特点和优势，从而宣传科学理论、传播先进文化、塑造美好心灵、弘扬社会正气，实现树立先进典型与推广先进典型的有机统一。湖北注重整合多种力量，灵活采用多种宣传形式，多管齐下，发动干部群众直接参与，使典型宣传成为舆论热点、社会焦点和群众关注点，引起社会广泛共鸣，进一步增强了典型宣传的渗透力。　　只有坚持充分发挥各级各类媒体的协同作用，壮大典型宣传的积极影响，才能使社会主义核心价值体系的主旋律广泛唱响。　　【问题】　　概括上述给定资料的主要内容。

[问答题]游戏为什么是促进幼儿心理发展的最好活动形式？

[单选题]具有了抽象的概念和一定的弹性，属于（）。

[单选题]具有了抽象的概念和一定的弹性，属于（）。

[单选题]下列哪个概念属于抽象概念（）

[单选题]概念实体是一种抽象概念，不考虑概念背后的物理存在，所以通常不包含与之相关联的其他（）。

[名词解释题]概念的抽象定义

[单选题]弱抽象又称“概念扩张式抽象”，是指由原型中选取某一特征或侧面加以抽象，从而形成比原型更为一般的概念或理论。这时，原型成为新的概念或理论的（）

[单选题]弱抽象又称“概念扩张式抽象”，是指由原型中选取某一特征或侧面加以抽象，从而形成比原型更为一般的概念或理论。这时，原型成为新的概念或理论的（）

[填空题]长期以来，在数据库设计中，广泛使用的概念模型当属“实体—联系”模型（简称E—R模型）。E—R模型中有3个基本的抽象概念，它们分别是实体、联系和（）。

[填空题]Megaco/H.248协议定义了两个抽象概念：终结点（termination）和（）.

[单选题]提出logos这个抽象概念的是（）。