单选题
学生在学习上希望获得好名次，其学习动机是（ ）。
发布日期：2021-03-18
外部
成就
交往
任务
试题解析
学习动机
学习动机是指引发与维持学生的学习行为，并使之指向一定学业目标的一种动力倾向。它包含学习需要和学习期待两个成分，根据不同标准可以划分为不同类别。不同心理学家从不同角度对学习动机进行了阐释，主要包括强化理论、归因理论、需要层次理论、成就动机理论、自我价值理论、自我效能感理论等。激发和培养学习动机的策略主要有采用启发式教学、控制动机水平、给予恰当评定、维护学习动机、正确处理竞争与合作等。
- 中文名
- 学习动机
- 应用学科
- 心理学
名次
名次，汉语词语，读音是míng cì，意思是指依照一定标准排列的姓名或名称的次序。
- 中文名
- 名次
- 解释
- 依照一定
- 拼音
- míng cì
- 近义词
- 排名
获得
获得(英文：HUODE或者HUODEX)是获得(北京)数字科技有限公司于2020年10月12日提交注册申请，于2021年7月21日获准注册的商标。
- 中文名
- 获得
- 所属行业
- 数字科技
- 所属公司
- 获得(北京)数字科技有限公司
- 外文名
- HUODE
- 创立时间
- 2021年7月21日
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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.The main idea of this passage is______.
灵芝的干燥方法为（）
政府企业化
粒细胞输注，应用时要同时具备几个条件（）
整组道岔在线上做铺设前的纵、横向移动时，应合理布置移动轮和滑行轨道，应由（）统一指挥，平稳移动。
（）“一丈青扈三娘”中的“一丈青”也是指一种发簪，《红楼梦》中提到哪个丫环也使用过“一丈青”？
完整的土地制度包括（）。
肝癌最早的转移途径是（）
送电时，先合断路器哪一侧隔离开关？为什么？
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