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
All U.S. nuclear weapons production facilities are presently closed down, and if the various agreements are adhered to, those fa
All U.S. nuclear weapons production facilities are presently closed down, and if the various agreements are adhered to, those fa
admin
2010-09-06
64
问题
All U.S. nuclear weapons production facilities are presently closed down, and if the various agreements are adhered to, those facilities will never be required except for one critical capability. All modern nuclear weapons use uranium(铀), plutonium(钚), and tritium(氚). Uranium and plutonium have very long half-lives, and there is large surplus of these materials.
Tritium, however, has a relatively short half life of about 12.6 years, so about 5 percent of the amount on hand must be replaced each year to maintain the current inventory. (46)
Because of the large retirement of nuclear weapons by the United States in compliance with early agreements and national policy, tritium from retired weapons has been used to make up that lost through natural decay.
(47)
However, in about 10 to 15 years, depending on future negotiations, the United States will need a guaranteed supply of tritium to maintain its stockpile at whatever level is agreed on.
In anticipation of this future need to produce tritium, Defense Office Executive is pursuing two technologies. One uses a nuclear reactor that could also produce electricity whose sale would recover not only the capital cost of the reactor but also its annual operational cost. (48)
Unfortunately, the present Administration has a definite bias against nuclear power, so an alternative method is also being pursued even though it is agreed that it will cost twice as much as a reactor and use as much electricity as a reactor would produce.
This technology uses an accelerator to produce high-energy protons that in turn produce neutrons.
The main argument for the accelerator is that it produces no conventional nuclear wastes. (49)
Proponents readily admit that it will produce radioactive materials, but with a relatively short half-life compared with that of wastes from spent nuclear fuel.
The fact that the accelerator will require the equivalent of a nuclear power plant to supply its electricity is ignored.
(50)
Proponents also neglect to mention that about 22 percent of all electrical energy generated in the United States comes from nuclear power plants, so that 22 percent of the power used by the accelerator will generate conventional nuclear wastes, in addition to those the accelerator produces.
There is an alternative to either the reactor or the accelerator, which is simply to buy the required tritium from Canada or Russia.
选项
答案
遗憾的是,当局对核能持有很大偏见。所以人们也在寻找另外一种替代方法,尽管这种方法被认为会耗费两倍于核反应堆的费用,消耗一个核反应堆所产生的电能。
解析
转载请注明原文地址:https://kaotiyun.com/show/TLZ4777K
0
考研英语一
相关试题推荐
Hopemaybethelovely,lyrical,inspiringthingmanypeoplebelieveitis—"thethingwithfeathers,"asEmilyDickinsoncalled
Wecanlearnfromthefirstparagraphthat______.NBACwillleavetheissueofembryoresearchundiscussedbecause______.
Whatwerethingslikein1980swhenaccidentshappened?Manufacturersasmentionedinthepassagetendto______.
Readthefollowingtextcarefullyandthenwriteasummarybasedonit.Yourshouldwriteabout100words.(10points)I
Youaregoingtoreadatextabouthowtokeepyourjob,followedbyalistofimportantexamples.Choosethebestexamplesfrom
Oneofthebasiccharacteristicsofcapitalismistheprivateownershipofthemajormeansofproduction—capital.Theownership
Whatisthepassagemainlyabout?WelearnfromthetextthatEdwardBannermanisprobably______.
AmericanandJapaneseresearchersaredevelopingasmartcarthatwillhelpdriversavoidaccidentsbypredictingwhentheyare
Energywillbeoneofthedefiningissuesofthiscentury.Onethingisclear:theeraof(1)_____Oilisover.Whatwealldon
Energywillbeoneofthedefiningissuesofthiscentury.Onethingisclear:theeraof(1)_____Oilisover.Whatwealldon
随机试题
足月儿,生后1天,母乳喂养,全身皮肤黄染明显,测血清总胆红素376μmol/L,母血型“O”,Rh阳性,父亲血型为A型,Rh阳性。首先应做何检查
(2019年济宁北湖区)谈谈在教学中如何发挥教师主导作用与学生主体作用的相统一。
纤毛具有清除呼吸道内分泌物和异物的功能,是气道重要的防御机制之一。
患者,女性,23岁。风湿性心脏病二尖瓣狭窄伴房颤已6年,半身麻木、活动不便1天,来院就诊,栓塞部位考虑是()。
(2007年)Windows98或Windows2000系统中的“剪贴板”是()。
张某是项目经理部新聘请的员工,其职责是负责运输拌制水泥混凝土的材料。一天,项目经理要求张某将一些不合格的石料掺进合格的石料中,张某拒绝了这个要求,张某行使了安全生产从业人员权利中的()。
辰辰由于在课堂行为不好而接受学校社会工作者王月的服务,到了结案期,辰辰的老师反映,最近辰辰本来好转的行为又回到了当初的状态,王月判断这时的辰辰是对即将到,来的结案产生了一种负面反应,即( )。
【S1】【S4】
【B1】【B2】
A、Beforedinner.B、Rightafterdinner.C、Duringdinner.D、Thenextday.A女士问男士是否介意在晚饭之前讨论明天的事务,男士表示不介意。故答案选A项。
最新回复
(
0
)