首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
财务会计
根据以下材料,回答 There is little debate about
根据以下材料,回答 There is little debate about
天天题库
2019-12-17
18
问题
根据以下材料,回答There is little debate about the firstdevelopment of the energy system of the 22nd century--that most of the energyproduced on a large scale will be in the form of electric power. Thus, most presentconcepts for major long-term energy sources (solar, geothermal, fusion) are basedupon electric power production at central plants.The second major development is thepotential use of hydrogen as both a basic fuel to replace natural gas and aspart of a general system to convert, store and transmit electric energy overlong district by fuel cells, or it could be used directly as a fuel forcommercial, industrial or transportation purposes.Although hydrogen seems likely to play amajor role in the future as a form of energy transport and storage, other processesmay also be useful. Here we note only two possibilities.Flywheels: It appears to be workable toconstruct flywheels of almost any needed size that would be efficientconverters (93-95 percent) in first storing and then releasing electric power.In addition, the kinetic (动力的) energy ofrotation is easily converted to alternating electric power. But the engineeringis at an early stage of development, and a decade or more may pass before this potentialcan be reliably estimated.Batteries and fuel cells: some of the manybatteries being developed today look quite promising. Within a decade or two, abattery-operated electric auto might even become competitive with today′ s vehicles,at least for driving ranges up to 200 miles. An electric automobile would bepollution-free,and would probably be more energy-efficient than theinternal-combustion (内燃) engine.A fuel cell (which may be considered a hydridebattery) with about 40 percent conversion efficiency is expected to enter powerproduction on a large scale within about five years. Unlike steam-poweredgenerators, fuel cells can be made large or small and their efficiency inoperation is essentially independent of the loading. Thus they may avoid mostof the distribution costs of electric power as well as provide pollution-fleepower and offer opportunities for using the "waste heat" effectively.From the passage we can see that thefuel cell might be something ___________.
选项
A.with the electric energy stored in itwithout pollutionB.in which chemicals are containedC.in which certain fuels such as hydrogenare filledD.like a small steam generator
答案
A
解析
细节题。根据最后一段中“fuel cellscan be…Thus they may avoid most of the distribution costsof electric power as well as provide pollution—fleepower”可知选A。
转载请注明原文地址:https://ti.zuoweng.com/ti/ZOksKKKQ
相关试题推荐
根据《招标投标法》规定,在工程建设招标投标过程中,开标的时间应在招标文件规定的(
下列行为中,不得代理的行为是() A、工程承包B、材料设备采购C、诉讼D、招
施工单位与材料供应商签订了商品混凝土供应合同,但在合同履行中,材料供应商迟延履行
根据《生产安全事故报告和调查处理条例》的有关规定,除交通事故、火灾事故外,自事故
根据我国担保法律制度,关于抵押权实现的说法,错误的是()
根据《建设工程施工合同(示范文本)》(GF-2013-0201),发包人责任和义
根据《标准施工招标文件》,下列关于质量条款的约定,正确的是()。
根据《计价规范》,下列关于合同价款和工程计量的约定,正确的是()。
根据《特种作业人员安全技术培训考核管理规定》,施工现场的压力焊作业人员应具备的条
根据工作流程图的绘制要求,该工作流程图中,表达错误的包括()。 A.①
随机试题
减税免税是对某些纳税人或征税对象的鼓励或照顾措施,它具有较强的政策目的性和(
某建设项目新水量为3924m3/h,外排高含盐水量21m3/h,计算新水利用
国际债券的特征包括()。Ⅰ.存在汇率风险Ⅱ.资金来源广Ⅲ.以自由兑换货币作为计量
(2006年真题)根据我国现行宪法的规定,国家对非公有制经济发展的指导方针是(
下列关于胃排空的叙述,正确的是A.食物入胃后30分钟开始排空B.高张溶液比等张溶液排空快C.普通混合食物完全排空需2?3小时D.人的情绪也能影响排空
某厂有职工147人,某月人均工资1020元,则这个月该厂工资总额约为()。A.1.5万元B.14万元C.15万元D.16万元
某女性患者,29岁。近半年来全口牙龈逐渐肿大,刷牙出血,偶有自发性出血史。 若诊断为白血病,在口腔还会表现为A.牙龈苍白、松软脆弱B.牙龈色鲜红、光亮、质软
某女,50岁。瘿瘤病史半年,近3日又见目赤肿痛。治疗宜首选的药物是()。A.密蒙花B.谷精草C.青葙子D.夏枯草E.决明子
要使近期建设规划真正能够发挥对城市建设活动的综合协调功能,必须从()等方面努力。A:建立城市建设的项目库并完善规划跟踪机制B:建立规划执行的责任追究机制C:
证券组合是指个人或机构投资者所持有的各种()。A.股权证券的总称B.流通证券的总称C.有价证券的总称D.上市证券的总称