2015考研英语阅读测量质量效应
<p> <span word="A">A</span> <span word="better">better</span> <span word="way">way</span> <span word="to">to</span> <span word="clean">clean</span> <span word="the">the</span> <span word="world">world</span> <span word="s">s</span> <span word="one">one</span> <span word="true">true</span> <span word="kilogram">kilogram</span></p><p> 清洁世界上真正一千克的更好方法</p><p> <span word="IN">IN</span> <span word="SEVRES">SEVRES</span>, <span word="on">on</span> <span word="the">the</span> <span word="outskirts">outskirts</span> <span word="of">of</span> <span word="Paris">Paris</span>, <span word="sealed">sealed</span> <span word="beneath">beneath</span> <span word="a">a</span> <span word="triplet">triplet</span> <span word="of">of</span> <span word="bell">bell</span> <span word="jars">jars</span> <span word="in">in</span> <span word="the">the</span> <span word="laboratoriesof">laboratoriesof</span> <span word="the">the</span> <span word="Bureau">Bureau</span> <span word="International">International</span> <span word="des">des</span> <span word="Poids">Poids</span> <span word="et">et</span> <span word="Mesures">Mesures</span>, <span word="sits">sits</span> <span word="a">a</span> <span word="small">small</span> <span word="cylinder">cylinder</span> <span word="of">of</span> <span word="platinum">platinum</span>-<span word="iridiumalloy">iridiumalloy</span>.</p><p> 在位于巴黎郊区的塞夫勒市，国际计量局实验室里，一个三层的钟形器皿里密封着一个铂铱合金制成的小圆柱。</p><p> <span word="Put">Put</span> <span word="it">it</span> <span word="on">on</span> <span word="a">a</span> <span word="scale">scale</span>, <span word="and">and</span> <span word="it">it</span> <span word="would">would</span> <span word="weigh">weigh</span> 1 <span word="kilogramwhich">kilogramwhich</span> <span word="is">is</span> <span word="appropriate">appropriate</span>, <span word="since">since</span> <span word="this">this</span> <span word="lump">lump</span> <span word="ofmetal">ofmetal</span> <span word="is">is</span> <span word="not">not</span> <span word="just">just</span> <span word="a">a</span> <span word="kilogram">kilogram</span> <span word="but">but</span> <span word="The">The</span> <span word="Kilogram">Kilogram</span>, <span word="the">the</span> <span word="ultimate">ultimate</span> <span word="reference">reference</span> <span word="standard">standard</span> <span word="for">for</span> <span word="the">the</span> <span word="waythe">waythe</span> <span word="Systeme">Systeme</span> <span word="internationale">internationale</span> <span word="d">d</span> <span word="unites">unites</span> <span word="measures">measures</span> <span word="mass">mass</span>.</p><p> 给这个小圆筒称重，你会发现它重1千克，这个重量刚刚好，因为这个金属块不只代表1千克，而代表着千克单位，是国际单位体系中测重的最终参考标准。</p><p> <span word="Scientists">Scientists</span> <span word="like">like</span> <span word="the">the</span> <span word="metric">metric</span> <span word="system">system</span> <span word="partly">partly</span> <span word="for">for</span> <span word="its">its</span> <span word="simplicityeverything">simplicityeverything</span> <span word="is">is</span> <span word="based">based</span> <span word="on">on</span> <span word="powers">powers</span> <span word="often">often</span>, <span word="which">which</span> <span word="makes">makes</span> <span word="calculation">calculation</span> <span word="easyand">easyand</span> <span word="partly">partly</span> <span word="for">for</span> <span word="the">the</span> <span word="elegance">elegance</span> <span word="of">of</span> <span word="its">its</span> <span word="foundations">foundations</span>.</p><p> 科学家亲睐公制的部分原因在于其简洁性，即任何物品以十为进制进行测量，方便运算;还有部分原因在于其成立基础很好。</p><p> <span word="Of">Of</span> <span word="its">its</span> <span word="seven">seven</span> <span word="fundamental">fundamental</span> <span word="units">units</span>, <span word="six">six</span> <span word="are">are</span> <span word="defined">defined</span> <span word="with">with</span> <span word="reference">reference</span> <span word="to">to</span> <span word="unvarying">unvarying</span> <span word="constants">constants</span> <span word="ofnature">ofnature</span>: <span word="the">the</span> <span word="ampere">ampere</span>, <span word="the">the</span> <span word="candela">candela</span>, <span word="the">the</span> <span word="second">second</span>, <span word="the">the</span> <span word="metre">metre</span>, <span word="the">the</span> <span word="kelvin">kelvin</span> <span word="and">and</span> <span word="the">the</span> <span word="mole">mole</span>.</p>
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