首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
Radiation occurs from three natural sources, radioactive material in the environment, such as in soil, rock, or building materia
Radiation occurs from three natural sources, radioactive material in the environment, such as in soil, rock, or building materia
admin
2010-05-05
54
问题
Radiation occurs from three natural sources, radioactive material in the environment, such as in soil, rock, or building materials; cosmic rays; and substances in the human body, such as radioactive potassium in bone and radioactive carbon in tissues. These natural sources account for an exposure of about 100 million a year for the average American.
The largest single source of man-made radiation in medical X-rays, yet most scientists agree that hazards from this source are not as great as those from weapons-test fallout, since strontium-90 and carbon-14 become incorporated into the body, hence delivering radiation for an entire lifetime. (46)
The issue is, however, by no means uncontroversial; indeed, the last two decades have witnessed intensified examination and dispute about the effects of low-level radiation.
A survey conducted in Britain confirmed that an abnormally high percentage of patients suffering from arthritis of the spine who had been treated with X-rays contracted cancer. Another study revealed a high incidence of childhood cancer in cases where the mother had been given X-rays. (47)
These studies have pointed to the need to reexamine the assumption that exposure to low linear energy transfer presented only a minor risk.
Recently, examination of the death certificates of former employees of a West Coast plant which produces plutonium for nuclear weapons revealed markedly higher rates for cancers of the pancreas, lung, bone marrow and lymph systems than would have been expected in a normal population.
(48)
While the National Academy of Sciences committee attributes these differences to chemical or other environmental causes, rather than radiation, other scientists maintain that any radiation exposure, no matter how small, leads to an increase in cancer risk.
(49)
It is believed by some that a dose of one rem, if sustained over many generations, would lead to an increase of one percent in the number of 1,000 disorders per million births.
In the meantime, regulatory efforts have been disorganized, fragmented, and inconsistent, characterized by internecine strife and bureaucratic delays. A Senate report concluded that coordination of regulation among involved departments and agencies was not possible because of jurisdictional disputes and confusion. (50)
One Federal agency has been unsuccessful in its efforts to obtain sufficient funding and manpower for the enforcement of existing radiation laws, and the chairperson of a panel especially created to develop a coordinated Federal program has resigned.
选项
答案
一家联邦机构为了强化实施现有的辐射法律,竭尽全力去获取充足的资金和人力,但却失败了。因而一个建组目的是为了协调发展这一联邦机构的计划的专题小组,它的主要负责人已经辞职了。
解析
注意本句的主干结构是以"and"连接的复合句。
转载请注明原文地址:https://jikaoti.com/ti/7BRRFFFM
0
考研英语一
相关试题推荐
TheU.S.systemofhighereducationiswidelyconsideredtheworld’sbest.Acollegeeducation【C1】________substantialbenefits—a
AnyAmericanwhohasboughtapackofcigarettessincethemid-60smighthaveseenthehealthwarnings.Itsays,"SURGEONGENERA
AnyAmericanwhohasboughtapackofcigarettessincethemid-60smighthaveseenthehealthwarnings.Itsays,"SURGEONGENERA
Itisacommonplaceamongmoraliststhatyoucannotgethappinessbypursuingit.Thisisonlytrueifyoupursueit【C1】________
WhenPaulGorski,thefounderofanorganizationcalledEdChange,visitscollegesanduniversitiestoadvisethemoncampusdiv
Earlierthismonth,researcherBeaverofFloridaStateUniversityreportedthatheandhisco-authorshadidentifiedgeneticmar
Shortstoriesareduearevival.Inrecentyears,therehavebeencritically【C1】________collectionsbyAmericanwriterssuchas
Studythefollowinggraphcarefullyandwriteanessayinwhichyoushould1)interpretthegraphbriefly,2)analyzepossibler
A.PlanfortheFinancialTransitionB.ExamineYourInvestmentPortfolioC.ContributetoanIRAD.SavebeforeYou
Theauthorbelievesthat______.Thehotspottheorymay’proveusefulinexplaining______.
随机试题
审计人员在审查丰达机器厂银行存款时,发现该厂20**年11月30日银行存款日记账账面余额为84400元,银行对账单余额为83000元。审计人员将银行存款日记账与银行对账单核对以后发现下面的问题:(1)11月2日企业账上开出134905号转账支票1
阅读《宝黛吵架》中的一段文字,然后回答以下小题。谁知这个话传到宝玉黛玉二人耳内,他二人竟从来没有听见过“不是冤家不聚头”的这句俗话儿,如今忽然得了这句。话,好似参禅的一般,都低头细嚼这句话的滋味儿,不觉的潸然泪下。虽然不曾见面,却一个在潇湘馆临风
关于生精干细胞的描述,错误的是
某部门的乙烯炼化一体化原油储运配套工程,原油管线全长230km,设计输油量2000万t/a,储油罐140万m3。工程分4个站场工程和6条线路工程,在首站建6座10万m3外浮顶油罐,在一个分输站建8座10万m3外浮顶油罐,无组织排放废气主要是原油储罐呼吸排放
在投标总价表中,需要签字的是( )。
对外来原始凭证进行真实性审核的内容包括()。
我国的企业年金基金实行()。
基金的会计责任主体包括()。
无公害农产品产地应当符合下列哪些条件?()
SuggestopediaI.IntroductionA.BasedonhowthebrainworksandhowwelearnmosteffectivelyB.Derivedfromsuggestionand
最新回复
(
0
)