英语专业八级考试模拟阅读试题英语专业八级考试模拟阅读试题2017我认为人生最美好的主旨和人类生活最幸福的结果，无过于学习了，以下是小编为大家搜索整理的英语专业八级考试模拟阅读试题2017，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!Thesearchforlatentprintsisdoneinasystematicandintelligentmanner.Investigatorsdeveloptechniquestolocatetracesoffingerprintsatacrimescene.Thebasicpremiseinsearchingforlatentprintsistoexaminemorecarefullythoseareas,whichwouldmostlikelybetouchedbypersonswhohavebeenonthescene.Thenaturalmannerinwhichapersonwoulduseandplacehishandsinmakinganentranceorexitfromabuildingorinhandlinganyobjectisthekeytothediscoveryoflatentprints.Whereaforcedentrancehasbeenmade,latentprintsarelikelytobefoundonanysurfaceadjacenttooratthatpoint.Anyobjectwithasmooth,non-poroussurfaceislikelytoretainlatentprintsiftouched.Fingerprintsonroughsurfacesareusuallyoflittlevalue.Ifthefingermarkdoesnotdiscloseridgedetailwhenviewedunderareadingglass,thechancesarethatitsvalueinidentificationisnilwhenphotographed.Wherefingermarksarefound,itwillbenecessaryfortheinvestigatortocomparethemagainsttheonesofpersonshavinglegitimateaccesstothepremisessothatthetracesmightbeeliminatedashavingevidentiaryvalueiftheyprovetobefromthesepersons.Placestosearchforprintsonanautomobilearetherearviewmirror,steeringwheelhub,steeringcolumn,windshielddashboardandthelike.Dustingofsurfacemaybedonewithafinebrushorwithanatomizer.Thewhitpowdersusedarebasicallyfinelypowderedwhitelead,talc,orchalk.AnotherlightpowderisbasicallyChemist’sgray.Agoodblackpowderiscomposedoflampblack,graphite,andpowderedacacia.Dragon’sbloodisgoodpowderforwhitesurfaceandcanbefixedonpaperbyheating.Indevelopinglatentprints,theacceptedmethodistousethepowdersparinglyandbrushlightly.Donotusepowderifthefingermarkisvisibleunderobliquelighting.Itcanbephotographed.Agoodpolicyforthenoviceistoexperimentwithhisownprintsonasurfacesimilartotheonehewishestosearchinordertodeterminethepowderbestsuitedtothesurface.Fingerprintsafterdustingmaybeliftedbyusingfreshcellulosetapeorcommerciallypreparedmaterialespeciallydesignedtoliftandtransferdust