简介：高考．作为全国性的选拨考试．是考生选择大学和进入大学的唯一资格标准。由国家统一组织调度，国家或省专门组织命题，统一时间考试。一年一度的高考已经结束，录取工作也已结束。

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简介：InthepresentpaperthevariationalsolutionofvelocityprofileforanincompressiblelaminarandfullydevelopedflowinisoscelestriangularductsisderivedbyapplyingtheKantovorichmethod.Thetheoreticalandexperimentalresultsofpressurelossarealsogiven.Thevelocitydistributionmodel,additionalpressurelosscoefficientandcalculatingmethodofinletlengthintheentranceregionofisoscelestriangularductsarealsoderived,whicharesuitableforvariouskindsofvertexangles.Thecalculationsandexperimentsarealsoperformedfortwomodels:theisoscelestriangularchannelswithvertexangles2α=45.1°and2α=60°.Comparisonsaremadebetweenthetheoreticalanalysisinthispaperandthoseoftheotherauthors.Itcanbeseenthatthepresentanalyticalresultisofhigh.accuracyandwidepracticability,andagreeswellwiththeauthors’experiment.

简介：AsimilarityequationforheattransferonheatsourceelementssituatedintheentranceregioninelectronicequipmentisdevelopedbasedontheexperimentaldataobtainedbySparrowetal.^[4].ThecharacteristicofthesimilarityequationisthattheratiooftheheattransfercoefficientattheentranceregiontothatatthefullydevelopedregionisindependentoftheReynoldsnumber.Itdependsonlyontherownumberoftheelementssituatedintheentranceregion.Anexampleoftheusefulnessofthesimilarityequationispresentedthatdeterminestheheattransferonheatsourceelementsinapowerunitthatcontainsonlyasmallnumberoftheheatsourceelements.

简介：Athree-dimensional(3-D)numericalmodelisestablishedtoinvestigatethetidalcurrentmotioncharacteristicsaroundtheharborentrance.Computationalapproachesconsistofthefinitedifferencemethod,time-splittingtechnique,C-grid,andahigh-orderturbulenceclosuremodel.TheOceanGeneralCirculationModel(OGCM)inundationschemeisincorporatedinthemodel.Anengineeringapplication,LianyungangHarbor,China,isusedasareal-lifecase.Themodelisvalidatedbyshowingthatthesimulatedresultsagreewellwiththefielddata.Intheapproachchannel,thetidalcurrentshowsadeflectioneffectespeciallyinthebottomlayer.AsforLianyungangHarbor,ajetflowformsatthetipofthenorthernbreakwater,whichdrivesacirculationflowattheinnersideoftheharborentrance.Inthevertical,theflowissignificantlystratifiedattheentrancesectionwithinthechannel,wheretheflowdirectionvariesbetweenlayersandthespeeddistributionisquiteuniform.These3-Dfeaturesbecomelessevidenttotheoffshore.Additionally,thesensitivityanalysisshowsthattheflowdeflectionisrelatedtothechanneldepth.Simulationresultsalsoimplythatthesiltationrateattheentrancesectionoftheapproachchanneltendstobemoreuniformbythe3-Dflowmotionfeature,andcouldbemoresignificantwiththeincreaseofthechanneldepth.

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简介：摘要：在体育中考改革的背景之下，小学与中学体育教学的联动性增强，在小学体育教学当中推广软式排球，可以显著发挥当前体育教学的特点，利用软式排球的柔软性、飞行速度慢以及色彩鲜艳等相映的体育教学的特征，突出当前体育教学的特性。文章研究软式排球在小学体育教学当中的优势，分析学生当前的接受度情况，指出软式排球在小学体育教学中的作用，并分析未来开展软式排球的教学特色，以提高学生的整体接受程度，促进一体化教学改革的形成。