更多“AHG2型氧气呼吸器的氧气瓶贮藏量（）L。”相关的问题
Can 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 US 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 Bush 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"s own magnetic field. The electric fields surrounding a powers line can be as high as 10 kilovolts per meter, 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." The 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 built into every warship and plane.
A．it may stir a great deal of debate among the Bush AdministrationB．every unit of the modern military has depended on the heavy use of some kind of electronic equipmentC．the Pentagon"s concern was understandableD．they had different arguments
点击查看答案
《医院感染管理规范》中规定：出现医院感染流行或暴发趋势时，医院感染管理科及时进行流行病学调查处理的基本内容为（）
A . 证实流行或暴发，查找感染源，引起感染的因素
B . 制定和组织落实有效的控制措施
C . 分析调查资料，对病例的科室分布、人群分布和时间分布进行描述；分析流行或暴发的原因，推测可能的感染源、感染途径或感染因素，结合实验室检查结果和采取控制措施的效果综合做出判断
D . 写出调查报告，总结经验，制定防范措施
E . 以上都不是
点击查看答案
证券投资基金在投资组合管理中需要对所投资证券进行研究与分析，关于该工作对证券市场的意义说法错误的是（ ）。
A．有利于提高市场的有效性，合理配置资源
B．有利于市场合理定价
C．有利于减少内幕信息和内幕交易
D．有利于促进信息有效利用和传播
点击查看答案
E4316、E5016焊条焊接时焊接电流为（）。
A . 交流或直流正接、反接
B . 直流正接
C . 交流或直流反接
D . 交流或直流正接
点击查看答案
4.设
f\ (\ x\ ) 在
[a,\ b] 上连续，且对任一多项式
g\ (\ x\ ) 成立
\int _{a}^{b}f(x)g(x)dx=0。证明：在
[a,\ b] 上成立，
f(x)\ 0．
已办理竣工决算后发生的购建固定资产借款利息支出，应计入（）
A.财务费用
B.工程成本
C.管理费用
D.营业外支出
点击查看答案
医德评价应坚持依据的辨证统一是指（ ）。
A.动机与目的、效果与手段的统一 B.动机与效果、目的与手段的统一 C.动机与手段、目的与效果的统一 D.目的与效果、目的与手段的统一 E.目的与动机、动机与效果的统一
点击查看答案
多旋翼无人机在姿态遥控状态下，如出现动力失效则正确的处理方法是？（）
A . 遥控器油门保持中间略上位置
B . 接地瞬间将油门收至最小
C . 始终保持油门最大位置试图恢复动力
点击查看答案
危险化学品生产企业应当提供与其生产的危险化学品相符的化学品安全技术说明书（MSDS），并在危险化学品包装（包括外包装件）上粘贴或者拴挂与包装内危险化学品相符的化学品安全标签。（）
点击查看答案
女，30岁，已婚，继发性痛经2年。2年前曾人工流产1次，术后开始痛经，进行性加重，平日月经规则3～4天／（28～30）天，量中。妇科检查：子宫较正常略大，后位，活动度差，子宫骶骨韧带处扪及数个小结节，有触痛，两侧附件增厚，轻度压缩，此患者最大可能的诊断是（）
A.子宫肌瘤
B.卵巢炎
C.子宫内膜异位症
D.慢性附件炎
E.生殖器结核
点击查看答案
依从阶段的行为具有哪些特点？（）
A．盲目性
B．被动性
C．不稳定
D．随情境的变化而变化
点击查看答案
If the population of the earth goes on increasing at its current rate, there will eventually no...In the author's opinions, ().
A．Venus is likely to be able to be inhabited by the people from the earth now
B．we have successful plans to solve the crowded conditions on the earth
C．the most urgent thing is that we are short of resources on earth
D．now the earth is the most suitable planet to live on
点击查看答案
一般大肠菌群是反映食品被（）污染的指标。
A.工业“三废”
B.粪便
C.添加剂
D.寄生虫
点击查看答案
题目内容
（请给出正确答案）
参考答案
十点题库官方参考答案
（由十点题库聘请的专业题库老师提供的解答）
