简介:摘要:随着智能手机终端技术的不断成熟和普及,“线下商店+网上平台”的经营模式,为企业提供了新的发展机会,同时也为消费者提供了足不出户的优质服务。本文以O2O模式下典型的电子商务企业美团为研究对象,从其盈利模式及其盈利模式存在的问题及对策进行分析,为提高美团的盈利能力和稳定性及推动美团网的商业化提出了新思路。
简介:AnO'-Sialon-Al2O3compositerefractorywaspreparedbyinsitureactionofSi3N4-ZrSiO4-Al2O3mixturewithfusedaluminaaggregates.Densification,insitureactionprocedureandmicrostructureofthematerialwereinvestigatedbymeansofX-raydiffraction,opticalandscanningelectronicmicroscopesandEDAX.
简介:the Japanese manufacturers chose to focus on making products that Western manufacturersignored. Thus,weather and terrain become less important. The same logic applies to many other situations. For example,日本产品现在已经能和西方最强的对手一较高低
简介:the Japanese manufacturers chose to focus on making products that Western manufacturersignored. Thus,weather and terrain become less important. The same logic applies to many other situations. For example,日本产品现在已经能和西方最强的对手一较高低
简介:Yb3+complexeswithtwonitrilotriaceticacidmoleculeswerepreparedandtheircompositionsweredeterminedasK3[Yb(nta)2(H2O)]*5H2OandNa3[Yb(nta)2]*6H2Obyelementalanalyses.Theirstructureswerecharacterizedbysingle-crystalX-raydiffractionanalyses.IncomplexK3[Yb(nta)2(H2O)]*5H2O,theYbN2O7partformsanine-coordinatemonocappedsquareantiprismaticstructure.IncomplexNa3[Yb(nta)2]*6H2O,theYbN2O6partformsaneight-coordinatesquareantiprismaticstructure.Itcanbeseenthattheoutercations(K+andNa+)greatlyaffectthecoordinationnumberandcoordinatestructurefromtheseresults.