简介：BenQPB8255拥有出色的性能指标，2000：1对比度、3000流明高亮，XGA分辨率，在光线充足的环境下也能投射出清晰、锐利、完美的画面，足以满足教育用户的特殊需求。

简介：PB8255陈采用封闭式引擎外，还配备特殊空气滤净系统，能够最大程度抵挡外界粉尘，特别适合粉尘较多的教室。对教育行业来说，可靠性高，易于维护、抵抗粉尘侵害等多方面做到细致完美，才能切实降低投影机的故障率，真正节省教学成本。

简介：推荐理由：除与上述PB8255相同的功能设计外，增加了“黄金色轮技术”，在不降低投影机亮度的同时让显示色彩更真实、更饱和，使影像品质更完美。

简介：StudyontheavoidanceresponseofPenaeuschinensistoheavymetals(Pb,Cr,Zn)andheavymetalmixtures(Pb-Cr,Pb-Zn)iscarredoutusingaY-modelavoidanceapparatus.Theconcentrationscalculatedtoinduce50%avoidanceratebyPenaeuschinensisare11.4,33.2and238.1mg/LforPb,CrandZn,respectively.MixturesofPb-CrandPb-ZnproduceadditiveeffectintheavoidancetestusingPenaeuschinesis.ButwhenthemixedPb-Znsolutionhas0.5toxicunitPband0.5toxicunitZn,themixtureseemstohavesynergisticeffect.

简介：我们由在固定联合盒子中在LHC/ALICE使用颜色玻璃冷凝物动力学学习高精力Pb+Pb碰撞的强子复合的伪快分发。在包括pomeron循环在中央快完成控告的强子复合以后，它被发现那比浸透基于计算的为中央Pb+Pb碰撞是大约1500，它显著地小，[?]1700/2500并且与那兼容基于在破碎区域的复合的研究。[从作者抽象]

简介：结合PB中的数据窗口控件,对数据存储作了深入的介绍,通过举例,说明了数据存储在实际应用程序设计中的重要性.

简介：近些年来,PB商品在欧美等发达国家的零售市场上十分盛行。PB(PrivateBrand)就是自有品牌商品,是由商店自己生产或组织生产并冠以自家商标(有些没有商标),主要在本店销售的商品。PB商品也称为SB(StoreBrana,商店品牌),与PB或SB相对应的是NB商品(NationalBrana,社会品牌)。

简介：摘要本文介绍了PB760呼吸机在使用过程中出现的开机报POSTPASSED及AIRINTAKEABSENT（空气吸入不足）的两例报警，还有开机开机工作后，报警FANFAILEDALERT的故障，分析及排除该故障的过程。

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简介：BasedonPb-Pbisochrondataofmorethan40Precambrianpolymetallicdeposits,theauthorsconsiderthattherearefourmineralizationperiodsforthePrecambriancopperdepositsinChina,andthemajorcopperdepositswereformedatabout1800Ma;therearethreemineralizationperiodsforgolddepositsformedfromArchaeantoProterozoic.BystudyinghundredsofleadisotopedatafromsomeMesozoiccontinentalsubvolcanicCuandAgpolymetallicdepositsandfine-disseminatedgolddeposits,theauthorsfoundthatthecalculationbasedontheleadsingle-stageevolutionmodelortwo-stageevolutionmodelcannotgivethetrueore-formingagesbutcanprovidemoreinformationaboutmineralizationandmaterialsourcesofthedeposits.

简介：鉴于金属参与化学反应的条件不同，致使金属性强弱有多种不同适用范围的衡量标度。从而阐明了在不同条件下Pb和Sn的金属性强弱不一致的原因。

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简介：AnexperimentwasconductedtostudytheeffectsofdifferentPbconcentrationsonriceseedgerminationandseedlinggrowthinthreecultivars(Jiayu293,Jiayu948andXieyou963).ThemethodofqualitativetraitscombiningwithquantitativetraitsbyorthogonalpolynomialswasappliedtoanalyzericeseedvigorbyregressionmodelTheseedsfromdifferentricecultivarshaddifferentsensitivitytoPbpoison.InthePbconcentrationof100-700mg/L,Pbsignificantlydecreasedrootlengthandshootheight,andthedegreeoftherestraintwouldaggravatewiththeincreasingofPbconcentration.However,Pbdidnotreducerootdryweightandshootdryweight,whichindicatedthatdifferentphysiologicalcharacteristicshaddifferentsensitivereactionstoPb.Thepredictingequationsofregressionweredeveloped,whichcouldbeusedtopredicttheeffectsofdifferentPbconcentrationsonriceseedvigor.

简介：多线程是指一个程序内部同时执行的多个流程，与单线程相比，它至少有两个方面的优点：第一，它可以更好地利用系统资源，比如CPU，若一个线程因I／O操作受阻，另一个线程仍可利用CPU来执行；第二，它更好地满足了客户的需求，因为挑剔的客户希望你开发的程序在显示动画的同时还能播放音乐、显示文件、下载网络文件等，这是单线程应用程序无法完成的。

简介：Inthisarticle,weinvestigatedeffectsofleadandcadmiumonthebiomassofginkgoseedlings,androlesoftheseedlingsinaccumulationcharacteristicsoftheheavymetalsandremediationofthesoilcontaminatedbyCd2+orPb2+aswellastheircombination.TheresultsshowedthatbothCd2+andPb2+significantlyorverysignificantlyreducedbiomassincrementofginkgoseedlings,withPb2+moreadversethanCd2+.TheCd2+-Pb2+compoundpollutionfurtherreducedbiomassincrementofginkgoseedlings.ThemassfractionsandenrichmentcoefficientofPb2+andCd2+inginkgoseedlingswereinanorderofroot>stem>leaf,whichwasinfavoroftransportationPb2+andCd2+fromroottostemandleave.TheCd2+-Pb2+compoundpollutionpromotedginkgoseedlingabsorptiontoCd2+andPb2+.ThecapacityoftheupwardtransportofPb2+wasgreaterthanthatofCd2+,whichsuggestedanobviousdose-effectandsynergisticeffect.Cd2+andPb2+accumulationsinginkgoseedlingswererelativelylarge.Theaccumulationinrootswashigherthanthatinstemsandleaves.Theabilityoftheabsorption,transportationandaccumulationofginkgoseedlingstoPb2+wasrelativelygreaterunderCd2+-Pb2+compoundpollution.ThephytoremediationefficiencyofCd2+andPb2+wasrelativelyhigh.

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简介：TheadsorptionkineticsofPb^2+ondifferentsoilsandmineralswithvariablechargeswasstudiedbythetwoion-selectiveelectrodetechniqueatdifferentpHandconcentrations.Theresultsshowedthatmorethan95%ofadsorptiononallthesamplesoccurredduringthefirst5minutes.Alladsorptiontime-dependentdatacouldfitthesurfacesecond-orderequationverywell.ThevaluesofXmweregoethite>kaolinite,andlatosol>redsoilatthesameinitialreactionconcentration.Thevaluesofkwerekaolinite>>goethite,andlatosol>redsoilatthesamereactionpHandinitialconcentration.ThehigherthesuspensionpH,thefastertheadsorptionoccurred.ThemeaningofXmgotbythetwoion-selectiveelectrodetechnique(onekindofbatchtechnique)wasdifferentfromthatbythemiscibledisplacementtechniqueinthattheformerwasonlytheequilibriumadsorptionamountatadefiniteconcentrationandpH,butthelatterwasalmostequaltotheadsorptioncapacityatadefinitepHwithmuchlessinfluenceofconcentration.OnePb^2+wassupposedtooccupytwoadsorptionsitesastheadsorptionmechanismisconcerned.

简介：长石和Pb(NO_3)_2在TAU=380degC被混合并且反应到synthesizePb长石。在XRD(X光检查衍射)产品的模式，五座山峰的d价值(踱步的晶体点阵)是0.654,0.342,0.332,0.327和0.257nm。XPS分析结果证明在长石的Pb4f_(7/2)的有约束力的精力在137.81之间-138.03eV。Pb~(2+)能通过离子交换反应在长石结构代替碱和碱地球阳离子形成Pb长石。

简介：Thesuper-largePb-ZndepositatFankouisverycomplexinmetallogenicmechanism.Syngeneticbrinesedimentation,hotsubmarinespringeruption-accumulation,syngeneticsedimentation-vadosebrinereplacementhadbeensupposedasthegeneticmodelsbefore.Underthesemodels,syngeneticmineralizationshouldbedominantinoreformation.However,aseriesofgeologicalandgeochemicalpropertiesinvestigatedbyauthorsofthispaperarecontrarytothesemodels.Therefore,theauthorsheresuggestthatthisdepositisatypicalpolygeneticcompoundoredepositwhichsharethepropertiesofmultistagesofgeotectonicevolution,multifactorsofmineralizationcontrol,multisystemofmaterialderivationofmineralization,multimodesofmineralizationandmultitypesofgenesis.