试题查看
试题查看
| {{B}} nAsA、invEntions you might usEEvEryDAy{{/B}} in 1958, prEsiDEntEisEnhowEr signED thE spACEACt, oFFiCiAlly CrEAting thE nAtionAlAEronAutiCs AnD spACEADministrAtion. From thE BEginning, thE purposE For thE nEw BrAnCh ExtEnDED BEyonD spACE ships AnD moon Boots. thE lAw prEsCriBED thAt its rEsEArCh AnD ADvAnCEmEnts shoulD BEnEFit All pEoplE, AnD in its 50-yEAr history, nAsA、hAs CErtAinly FulFillED thAt rolE. Although most pEoplE toDAy will nEvEr sEt Foot on thE moon, EvEryonE likEly ComEs in Con tACt with A nAsA、By-proDuCt EvEry DAy. pArtnEring with vArious rEsEArCh tEAms AnD CompAniEs, nAsA、ContinuEs to proDuCE A vAst ArrAy oF nEw tEChnologiEs AnD proDuCts thAt hAvE improvED our DAily livEs.BAsiC stEps in hEAlth, sAFEty, CommuniCAtions AnD EvEn CAsuAl EntErtAinmEnt FinD thEir roots in thE govErnmEnt BrAnCh Commonly AssoCiAtED with roCkEt ships AnD FloAting pEoplE. in FACt, nAsA、hAs FilED morE thAn 6,300 pAtEnts with thE u.s. govErnmEnt. EACh yEAr sinCE 1976, nAsA、hAs puBlishED A list oF EvEry CommErCiAlizED tEChnology AnD proDuCt linkED to its rEsEArCh. thE nAsA、journAl spinoFF highlights thEsE proDuCts, whiCh hAvE inCluDED things likE improvED pACEmAkErs, stAtE oF thE Art ExErCisE mAChinEs AnD sAtEllitE rADio.EACh proDuCt wAs mADE possiBlE thAnks to A nAsA、iDEA or innovAtion. But it DoEsn’t tAkE A roCkEt sCiEntist to usE mAny oF thEsE so-CAllED By-proDuCts. rEAD on to lEArn ABout somE oF thEsE FAmiliAr proDuCts. {{B}} 1. wAtEr FiltErs{{/B}} wAtEr is thE EssEntiAl ingrEDiEnt to humAn survivAl. sinCE pEoplE CAnnot livE without wAtEr, thE ABility to ConvErt ContAminAtED wAtEr to purE wAtEr is An inCrEDiBly importAnt sCiEntiFiC AChiEvEmEnt. AstronAuts nEEDED A wAy to ClEAnsE wAtEr thEy tAkE up into spACE, sinCE BACtEriA AnD siCknEss woulD BE highly proBlEmAtiC、wAtEr FiltEr tEChnology hAD ExistED sinCE thE EArly 1950s, But nAsA、wAntED to know how to ClEAn wAtEr in morE ExtrEmE situAtions AnD kEEp it ClEAn For longEr pErioDs oF timE. iF you look At A wAtEr FiltEr, you CAn usuAlly DEtECt smAll Chunks oF {{i}}ChArCoAl{{/i}} (木炭) insiDE oF thEm. somEtimEs, whEn you First usE A wAtEr FiltEr, you’ll EvEn notiCE tiny BlACk FlECks From thosE Chunks. this ChArCoAl is spECiAlly ACtivAtED AnD ContAins silvEr ions thAt nEutrAlizE BACtEriA in thE wAtEr.Along with killing BACtEriA in thE wAtEr, thE FiltErs Also prEvEnt FurthEr BACtEriAl growth.CompAniEs hAvE BorrowED From this sAmE tEChnology to Bring us thE wAtEr FiltEr systEms millions oF pEoplE usE At homE EvEry DAy. {{B}} 2.CorDlEss tools{{/B}} whEn you’rE suCking up Bits oF Dirt or CrumBs ArounD thE housE with A hAnDhElD CorDlEss vACuum, you ArE ACtuAlly using thE sAmE tEChnology thAt AstronAuts usED on thE moon.AlthoughBlACk &DECkEr hAD AlrEADy invEntED thE First BAttEry-powErED tools in 1961, thE nAsA-rElAtED rEsEArCh hElpED rEFinE thE tEChnology thAt lED to lightwEight, CorDlEss mEDiCAl instrumEnts, hAnD hElD vACuum ClEAnErs AnD othEr tools. in thE miD-1960s, to prEpArE For thEApollo missions to thE moon, nAsA、nEEDED A tool thAt AstronAuts CoulD usE to oBtAin sAmplEs oF roCks AnD soil. thE Drill hAD to BE lightwEight, CompACt AnD powErFul Enough to Dig DEEp into thE surFACE oF thE moon. sinCE rigging up A CorD to A Drill in outEr spACE woulD BE A DiFFiCult FEAt, nAsA、AnDBlACk &DECkEr invEntED A BAttEry-powErED, mAgnEt-motor Drill. working in thE ContExt oF A limitED spACE EnvironmEnt,BlACk &DECkEr DEvElopED A ComputEr progrAm For thE tool thAt rEDuCED thE Amount oF powEr ExpEnDED During usE to mAximizE BAttEry liFE. AFtEr thE nAsA、projECt,BlACk &DECkEr AppliED thE sAmE prinCiplEs to mAkE othEr lightwEight, BAttEry-powErED tools For EvEryDAy ConsumErs. {{B}} 3. long-DistAnCE tElECommuniCAtions{{/B}} thE ABi
查看答案解析
正在加载...
正在加载... 根据网考网移动考试中心的统计，该试题： 11%的考友选择了A选项 59%的考友选择了B选项 7%的考友选择了C选项 23%的考友选择了D选项 |
参考答案： 
答案解析