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
专升本
Wind, wave and tides all suffer from the fact that they are variable sources of power output. For example, there will be times w
Wind, wave and tides all suffer from the fact that they are variable sources of power output. For example, there will be times w
admin
2009-08-21
32
问题
Wind, wave and tides all suffer from the fact that they are variable sources of power output. For example, there will be times when due to windless days or calm seas—and both can occur for periods of several days even in the winter time—they are producing little or no power.
Insofar as this shortfall has to be made up by electricity from conventional power stations, these newer energy sources would not necessarily reduce the installed capacity of such conventional stations needed to meet the total demand on windless or calm days. What the newer sources will do is to save fuel that would otherwise be burned in conventional power stations.
Pumped storage reservoirs could in principle be used to counter this effect, but there 1 is not enough additional reservoir capacity available. We therefore face the same type of storage problem as in solar energy. Thus, unless some new method of energy storage can be developed or we move to the widespread use of a fuel like hydrogen, the wind and wave schemes will be at an economic disadvantage.
选项
A、is not as consistent as it should be
B、is generally less in winter than in summer
C、is never likely to be very great
D、is consistent
答案
A
解析
细节题。根据文章首句中的“variable sources”,A选项与之意思相当。
转载请注明原文地址:https://kaotiyun.com/show/hYSC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
现阶段我国全民所有制采取的形式是()。
WhydidStanleyWilliamswriteanti-gangbooks?WhichofthefollowingwouldWilliamswanttobehislegacy?
Manypeoplefindhomegardening______.Awell-plannedandwell-keptgardencanprovideasupplyoffreshvegetables______.
Forthispart,youaresupposedtowritealetterin100-120wordsbasedonthefollowingsituation.假设你刚刚得到一份工作,但因某种原因不能按规定
ThewinterinIcelandhasbeenone0ftheworstever.AnanimalthatwasborninIcelandandjustreturnedtherehasenjoyedthe
KathyAllenhasbreastcancer.Sheneedstoknowwhichkindofmedicinetotake.Doctorswanttoknowthemedicalhistoryof
Thisletterismostprobablywrittenby______.Fromthepassage,wecanlearnthattheauthorlooksontheworld______.
Seeingandperceivingare______.Whichofthefollowingisimpliedbutnotstatedinthepassage?
Didyouseethatboy______thepoliceoverthere.
Neverlaughatasnowcoveredmountain!Laughterandyelling,duringtheavalancheseason,cancauseadeadlypileofsnow.Huge
随机试题
剧烈运动时尿量减少的主要原因是
A、微粉硅胶B、邻苯二甲酸醋酸纤维素C、羧甲基淀粉钠D、氮酮E、糖浆下列物质中,用作润滑剂的是
挂牌期限届满,按照下列()规定确定是否成交。
以下去掉哪一项之后,剩下的图形呈现一定的规律性?
一位在本市很受群众欢迎的相声演员本已答应参加明天的“文化下乡”活动。但今天他临时变卦,假称生病,其实他是想去外地参加一场商业演出。作为文联副主席,你将如何劝说他参加“文化下乡”活动?请现场模拟一下。
今天,科技发展极大地改善了人类生活的方方面面,使得人们难以脱离科技成果,退回到现代科技之前的生活状态中。但越来越多的人也意识到,一些科技成果常常携带着________的后果,可能对人类生活产生负面影响。填入画横线部分最恰当的一项是()。
PresidentBarackObamaclaimedprogressWednesdayinhissecond-termdrivetocombatclimatechangebutsaidmoremustbedonet
Whatnewresearchrevealsabouttheadolescentbrain.We’relearningthattheteenyearsareaperiodofcrucialbraindevelopm
Whatwouldyoudowith?$590m?ThisisnowaquestionforGloriaMackenzie,an84-year-oldwidowwhorecentlyemergedfromher
Wehavenotdecidedwhichhotel______.
最新回复
(
0
)