positive: Is the flower red or blue?<br>那花是红的还是蓝的?<br>He didn't decide whether to go to the film or to watch TV.<br>他还没有定下来去看电影还是看电视。<br>4.and与or的区别在于:and一般用于肯定句中,否定句中则用or。在少数情况下,and也用于否定句中,这时not否定的是后者而不是前者; 而or所连接的两个部分都是否定。<br>5.either...or 或者…或者…,不是…就是…<br>or else 用以表示威胁<br>or rather 说得更确切些或加以更正
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