positive: conj.⒈或,或者⒉(用于否定句,提出两种或多种事物时)也不⒊(用于警告和忠告)否则⒋(用于两个数字之间表示约略数目)大约⒌(用于引出解释性词语)或者说⒍(用于说明原因)⒎用于引出对比的概念orso大约(表示对人、事、地点没有多大的把握)在否定句中的and应改为or,例如:Ihaveapplesandpears.否定句就应为:Idon'thaveapplesorpears.OR缩写词abbr.⒈=Operatingroom手术室;操作室⒉=Oregon-or后缀suf.(名词词尾)
negative: AnalysisofFunctionalPerformanceofRemovableRotationFlatsofDifferentMaterialsofCardingMachineHEShanshan1 ,ZHANGYi2(1.CollegeofTextiles , DonghuaUniversity , Shanghai201620 , China ;2.ZhejiangChangshanTextileCo. , Ltd. , Quzhou324200 , China )Abstract : ThecausesofheelGandGtoesectionabrasionofremovablerotationflatsofcardingmachinewereexplainedbyanalyzingthestructureoftheremovablerotationflatsofcardingmachineanditsrunningstateduringoperationincardingarea , andameasurementmethodonheelGandGtoesectionwasproposed.ContrastexperimentswereconductedonfrequentlyGusedcastironrotationflatsandaluminiumalloyrotationflats.Theresultsshowedthataluminiumalloyrotationflatsperformedbetterinreducingenergyconsumptionofcardingmachineandextendingtheservicelifeofremovablecoverplateforitsadvantagesofgoodyarnquality , highwearresistance , andlightweight.Keywords : cardingmachine ; rotationflats ; heelGandGtoesection ; abrasion ; energyconsumption ;antiGabrasion