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简介：Globalpropertyisthenecessaryconditionwhichmustbesatisfiedbytheprovableformulas.Itcanhelptofindoutsomeunprovableformulathatdoesnotsatisfysomeglobalpropertybeforeprovingitusingformalautomatedreasoningsystems,thustheefficiencyofthewholesystemisimproved.ThispaperpresentssomeglobalpropertiesofvalidformulasinmodallogicK.Suchpropertiesarestructurecharactersofformulas,sotheyaresimpleandeasytocheck.Atthesametime,someglobalpropertiesofKunsatisfiableformulasetarealsogiven.

简介：the reasons for teaching writing to college students of English as a foreign language are not only that writing is a basic language skill but also that writing can 1) reinforce acquired language ability,It goes without saying that the demonstration of language ability relies more on the active or productive skills like speaking and writing. As for the two active or productive skills,writing is an especially effective way of further developing their language ability since it is such an active (compared with reading

简介：在这篇文章，我们认为multiclass网络是平衡问题。当系统目的功能被全部的排放测量时，那么称为强烈有效的使用费的A能作为系统最小支持任何multiclass用户平衡流动模式。用霍夫曼词根和准确penalization方法，我们为multiclass网络平衡问题提供强烈有效的使用费的存在。

简介：and to undertake practical writing. They should be able to write within 30 minutes a short composition of 120 words on a general topic or an outline. The composition should be basically complete in content,learning the present English writing requirements for college students in China is also critical to the improvement of writing instruction and practice. ,the writing requirements for undergraduate college English teaching are set at three levels

简介：Inthispaper,theauthorspointoutanddemonstratethedifferenceoftheconceptsconcerningco-satisfiableandco-validbetweenonefirst-orderlanguageandtwofirst-orderlanguages,andputforwardtheconceptsaboutuniformco-identicaltruthanduniformco-satisfiability.Thussometheoremsinthebook“ACourseinMathematicalLogic”,writtenbyJ.L.BellandM.Machover,arecorrected.

简介：Inaccordancewithanewcompensationprincipleofdiscretecomputations,thetraditionalmeteo-rologicalglobal(pseudo-)spectralschemesofbarotropicprimitiveequation(s)aretransformedintoperfectenergyconservativefidelityschemes,thusresolvingtheproblemsofbothnonlinearcomputa-tionalinstabilityandincompleteenergyconservation,andraisingthecomputationalefficiencyofthetraditionalschemes.Asthenumericaltestsofthenewschemesdemonstrate,insolvingtheproblemofenergyconser-vationinoperationalcomputations,thenewschemescaneliminatethe(nonlinear)computationalin-stabilityand,tosomeextenteventhe(nonlinear)computationaldivergingasfoundinthetraditionalschemes,Furthercontrastsbetweennewandtraditionalschemesalsoindicatethat,indiscreteopera-tionalcomputations,thenewschemeinthecaseofnondivergenceiscapableofprolongingthevalidin-tegraltimeofthecorrespondingtraditionalscheme,andeliminatingcertainkindofsystematicalcom-putational“climatedrift”,meanwhileincreasingitscomputationalaccuracyandreducingitsamountofcomputation.Theworkingprincipleofthispaperisalsoapplicabletotheproblemconcerningbaroclin-icprimitiveequations.