射频识别技术属于物联网产业链的（）环节。

已知x1=(2,4)T,x2=(4,8)T是某线性规划问题的两个最优解，则下面也是该线性规划问题最优解的是()

请问10bit的视频会有多少个色阶？

中国电视采用那种制式？

习近平新时代中国特色社会主义思想最重要最核心的内容是（）。

人与自然相处时应承担的重要责任是（）。

判断指令对错SHLAX，4

要使寄存器AL中的高4位不变，低4位为0，所用指令为（）。

Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humidorpollutedoutsideair,theyposemanypotentialhealthhazards.Muchresearchhaslookedathowthemovementofairinsideaclosedenvironment---suchasanofficebuilding---canspreaddiseaseorexposepeopleinthebuildingtoharmfulchemicals.OneofthemorewidelypublicizeddangersisthatofLegionnaire’sdisease,whichwasfirstrecognizedinthe1970s.Thiswasfoundtohaveaffectedpeopleinbuildingswithair-conditioningsystemsinwhichwarmairpumpedoutofthesystem’coolingtowerswassomehowsuckedbackintotheairintake(通风口),inmostcasesduetopoordesign.Thewarmair,filledwithbacteria,wascombinedwithcooled,conditionedairandwasthencirculatedaroundvariouspartsofthebuilding.Studiesshowedthatevenpeopleoutsidesuchbuildingswereatriskiftheywalkedpastairexhaustpipes.Largeair-conditioningsystemsaddwatertotheairtheycirculatebymeansofhumidifiers(湿度调节器).Inoldersystems,thewaterusedforthisprocessiskeptinspecialreservoirs,thebottomsofwhichprovidebreedinggroundsforbacteriawhichcanfindtheirwayintotheventilation(通风)system.Therisktohumanhealthfromthissituationhasbeenhighlightedbythefactthattheimmunesystems(免疫系统)ofapproximatelyhalfofworkersinair-conditionedofficebuildingshavedevelopedtheabilitytofightofftheorganismsfoundatthebottomofsystemreservoirs.Butchemicalscalled“biocides”areaddedtoreservoirstomakethemgerm-free,andtheyaredangerousintheirownrightinsufficientquantities,astheyoftencontaincompoundsstronglylinkedtocancers.Finally,itshouldbepointedoutthattheartificialclimaticenvironmentcreatedbyair-conditionerscanalsoaffectus.Inanaturalenvironment,whetherindoororoutdoor,therearesmallvariationsintemperatureandhumidity.Indeed,thehumanbodyhaslongbeenaccustomedtothesenormalchanges.Inanair-conditionedlivingorworkingenvironment,however,bodytemperaturesremainwellunder37℃,ournormaltemperature.Thisleadstoaweakenedimmunesystemandthusgreaterexposuretodiseasessuchascoldsandflu.Theauthormostprobablywantsthereaderstotreatbiocideswithanattitudeof_.

49.Whatdowelearnaboutthemedicalcommunity?A)Theynowhaveastronginterestinresearchonaging.B)Theydifferfromtheacademiccirclesintheirviewonaging.C)Theycancontributetopeople’shealthonlytoalimitedextent.D)Theyhavewaystointerveneinpeople'sagingprocess.

4.计划经济与市场经济的主要区别在于（）

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4

根据我国《专利法》的规定，专利权的客体包括（）。

下列活动中，不可以委托代理的是（）。