背景包含SirPlushasademandfunctionformeadthatisgivenbytheequationD(p)=100-P.Ifthepriceofmeadis75,howmuchisSirPlus'snetconsumersurplus?A:625B:312.5C:25D:156.25

SiRNA的作用方式为与靶基因严格互补配对，介绍而miRNAA:对B:错

SIRS肺损伤的主要病变之一是肺水肿，个下其主要的机理是（）A:SIRS引起的左心衰B:SIRS时血浆胶渗压降低C:SIRS时肺毛细血管通透性增高D:SIRS时肺毛细血管内压增高E:肺部淋巴回流受阻

背景包含SIR模型把人群分成哪几类？A:未隔离的已感染者B:已感染者C:易感染者D:移除者

SIR模型把人群分成易感染者、介绍已感染者和移除者三种人群。A:错B:对

SIS模型把人群分成易感染者、个下已感染者和治愈后没有免疫力易感染者三种人群。A:对B:错

背景包含SIS模型与考虑生死的SIS模型的求解过程完全不同。A:错B:对

sitcom、介绍roommate、sci-fi都是拼缀词。A:错B:对

个下site指令的意思是将搜索范围限定在特定网站中。A:错B:对

背景包含S-N-K方法是一种有效划分相似性（）的方法A:空集B:全集C:交集D:子集

介绍Snoringisbadforsleepbutthemedicalcommunitycontinuestomake_____(进步A:progressB:suppressC:aggressD:pressure

SNP是指基因组上单个碱基的变化，个下包括单碱基的转换、颠换、插入及缺失等。A:对B:错

背景包含Sowhichvenuewillbeavailableaswellasaffordableforustousefortheexhibition?这句话的意思是___。A:所以哪个会场可以被利用到展览中呢？B:所以哪一个会场我们既负担得起又可供我们使用呢?C:所以哪个会场是可利用的同时也是可负担的展览呢？

介绍So,“theAmericanDream”forthesettlers’wastoowntheirownland,havetheirownfarmsandnotbecontrolledorhavetoliveundertheauthorityofalandowner.___________A:对B:错

SO16890标准对过滤器分级是根据干净过滤器的初试效率进行分级的？A:对B:错

SO2、O3都是顺磁性分子。A:对B:错

SO2.Na2SO3.NaHSO3都能直接抑制酚酶。A:错B:对

SO3吸收的工艺的泵后流程是指冷却器放在泵后，酸由泵强输送制通过冷却器，传热效果好，但酸因受压而容易发生泄露。（）A:对B:错

Sobel算子和Robert算子都是常见的边缘检测算子。下列关于这两个边缘检测算子的说法中正确的有（）。A:B:Sobel算子、Robert算子都属于基于图像灰度的一阶导数边缘检测算子C:Robert算子定位精度高但对噪声敏感D:Sobel算子检测垂直边缘的效果好于斜向边缘

Sociolinguisticsisoneofthebranchesofappliedlinguistics.A:错B:对

Sociolinguisticsisthestudyoflanguageinrelationtosociety.A:错B:对

SOD本质是一种（）。A:核酸B:脂类C:糖D:蛋白质

Softwarereferstotheprogramsthattellhardwarewhattodo.A:对B:错

SOLER技术包括（）A:E（eyes）：目光接触B:L（lean）：身体微微前倾C:O（open）：姿势要自然开放D:S（sit）：坐要面对别人E:R（relax）：放松

SolidWorks“抽壳”特征可以支持不等壁厚抽壳。A:错B:对

SolidWorks“筋”特征对应的草图一般不是封闭的。A:错B:对

SolidWorks草图尺寸改变后相应的特征造型也会改变。A:错B:对

SolidWorks中草图绘制时可以绘制连续线圆，无法绘制中心线圆，也不能将连续线圆转化成中心线圆。A:对B:错

Solidworks创建基准面时可选用下列那种方式。A:曲面切平面B:样条曲线的端点C:与基准面平行等距D:过直线平面成夹角E:点和直线

SolidWorks的工程图也能保存成JPG格式的图片。A:对B:错

Solidworks的主要建模技术是（）。A:附加特征建模B:特征建模C:参数建模D:基础特征建模

SolidWorks可以生成阶梯剖视图。在做阶梯剖视截面时，草图直线最多由几段直线构成？A:4段B:3段C:任意数量

SolidWorks可以生成旋转剖视图，并将其展开。在做旋转截面时，草图直线最多由几段直线构成？A:任意数量B:2段C:3段

Solidworks中草图显示为蓝色是由于该草图（）。A:欠定义B:未被激活C:过定义D:未被选中

SolidWorks中零件、装配体和工程图的文件格式分别为（）。A:sldasmsldprtslddrwB:sldprtsldasmslddrwC:sldprtslddrwsldasm

solow模型在供给方面的假定有A:一个经济的人均投资等于人均储蓄B:规模报酬不变C:要素边际产出大于零且递减D:稻田条件

Someairlinesmayforbidyoufrom______withoutproperID.A:aboardB:beingboardingC:onboardD:boarding

SomeBritishholidaysarecelebratedtomarktheimportanteventsoftheChristiancalendar,andothersarerelatedtolocalcustomsandtraditions.A:对B:错

Somechoiceisundoubtedlybetterthannone,butmoreisnotalwaysbetterthanless.A:错B:对

Somecompanieswanttomakeshopperswaitaroundlongerinthehopetheywillspotsomethingtobuy.A:sothatB:inthewayC:inorderthatD:inthehope

Someimplicationsarebestrepresentedbyspecialsoundfeatures(eg.risingtone),notbysyntacticfeatures.A:对B:错

Someofyoursuggestionshavebeen_________,butothershavebeeA:adjustedB:adaptedC:adeptD:adopted

Somepeoplebelievethattheearthcan_________enoughfoodtosupportatleasttwiceitspresentpopulation.A:emergeB:resortC:submitD:yield

SomepeoplesayIbearastriking&nbsA:familiarB:resemblanceC:resentmentD:similar

Somepeoplewillmisunderstandyour______andunlessyoudoitinthenon-threateningway.A:goalB:intendC:intentionD:attention

SomestudentsaregoingtoChinainsummervacation,and____.A:somearetoAmericaB:sometoAmericaC:somegoingtoAmericaD:someAmerica

Somestudentshaveto_____goingabroadforfurtherstudybecausetheirfamilycannotaffordtheireducation.A:preventB:desistfromC:standD:continue

Someteachersandparentsdon’t_____theuseofe-readers.Oneoftheirreasonsise-readerswilldoharmtoeyesight.A:affectB:advocateC:adaptD:afford

SomethinkitlookslikearainbowcastleandRushsaidit’stotallyopento().A:understandingB:translationC:comprehensionD:interpretation

SomesA:failedB:testedC:forcedD:expelled

Someonehasfireinhisbellymeans_____A:heisangryB:heishappyC:heispassionateD:hehasastomachache

Someonewhocanspeakmanylanguagesiscalled________.A:GeniusB:LinguistC:PolyglotD:Bilingualist

SomeonewhoisA:awareB:beneficialC:cautiousD:common

Someone'sAchilles’heelishisweaknessthatcausesproblemsforthem,especiallybecauseitgivesotherpeopleachancetoattackorcriticizethem.A:对B:错

Sometimesthecontrollingideaimpliedinthethesisstatement.A:对B:错

Sometimesaninvestorwillendtheirpositioninyourcompany,whatistheirplancalled?（）A:TerminationPlanB:ExitStrategyC:TerminationContractD:ExitClause

Sometimes,theexportlicenseisnecessaryforsomeexportedcommodities.A:TrueB:False

Sometimes,theobstaclesinthewayoftradingaffectthemutualrelationship（）A:usefullyB:adverselyC:profitablyD:advantageously

Songsandworksshouldbeprotectedbycopyright.A:错B:对

SonsandLovers,anautobiographicalnovelbyD.H.Lawrence,A:对B:错

一个好的背景介绍包含以下哪些方面？