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孟凡伟 《商丘师范学院学报》1996,(Z3)
研究了一阶方程(r(t)x’)’+a(t)x=0(*)和(r(t)x’)’+(a(t)+b(t)x=f(t)(*)按极限圆型分类问题,给出了方程(*)是极限圆型的充要条件,另外还给出了方程(*)和方程(*)是L·b的一些判别准则.))tobelonyL.c.Keywords:nonhomogeneousdifferentialequatioins;secondorder;limitcirclecase;necessaryandsufficientcondition 相似文献
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Hui Xu Ph. D. Kai-yuan He Shu-li He Li-zhi Cheng Yuan-da Dong Xue-shan Xiao 《上海大学学报(英文版)》1999,3(4):318-320
1 Introduction FerichnanocrystallineFeZrBalloyssimultaneouslyshowgoodsoftmagneticpropertiesandlargesaturationmagnetization[1,2].Therearemainlytwophasesinthealloyswithoptimummagneticproperties:ananocrystallineαFephaseandanintergranularamorphousphas… 相似文献
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李树 《教学月刊(小学版)》2002,(11)
Theme:TheBodyPartsFunction:IntroducingthebodypartsStructure:TheImperativeSentence(verb +theobject)Vocabulary:finger/leg/body/arm/foot/handTeachingaids:multimedia/somewordcardswiththesixnewwordsStepI:Warm -up1.FreeTalk:Gettoknoweachother.T:Hello,Kids.Nic… 相似文献
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Alberto Rocha TONG Fu 《上海大学学报(英文版)》1999,3(4):293-298
1 Introduction Breastcancerisoneofthemostmalignantdiseases,especiallyforwomen.Anearlydetectioncansavelives,achievedbyearlydetectionwithmammograms.Itisanintensivetaskfortheradiologistbecausemultiplereadingsofasinglemammogramarenecessaryinordertoincre… 相似文献
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XIAO Xue shan * ** DONG Yuan da * MO Zhi shen ** ZHU Ming yuan * WANG Xian hong ** QIAO Xiu ying ** WANG Qing * XU Hui * 《上海大学学报(英文版)》1999,3(4):336-338
1 Introduction Thereducedgravitymaterialsprocessinghasbeenextensivelyusedtostudymetalsandglassesinthepastdecade[1~3].Toourknowledge,polymericmaterialshavenotbeenmentionedinthelowgravityenvironmentonthegroundbase.Thegravity,however,shouldplayanimpo… 相似文献
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在英语精读教学中,释义教法是讲解课文一种行之有效的教学方法。释义即:对一个句子或一个词,在不改变意义的基础上,用另外的、比较清楚、比较简单的语言重新表达出来。现举出精读课文中的一些句子为例加以分析。以便于理解,现举例说明如下: 1. But for ten years,while he continued to experiment withpenicillin, his discovery was largely ignored by the medicalworid. Paraphrase :Nearing… 相似文献
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中学生英语常见错误20例析□临洮中学赵玉兰1You’dbetertelhimthenewsatonce.(正)You’dbetertotelhimthenewsatonce.(误)说明:hadbeter,wouldrather,can’tbut等惯... 相似文献
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ALateforamostimportantlecture,IdashedoutofthefrontdoorandrealizedthatIhadleftmykeysonthedin ing roomtable.Thebackdoorwasunlocked,butasixfootwoodenfencestoodbetweenmeandthekeys.ThecarwasparkedsothatIcouldstandonittogetuponthefence,butinmytightskirtthat… 相似文献
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《英美概况》模拟试题姬生雷1.Readthefollowingsentences.IfthestatementIstrue,makeaplussigh”+”Intheblankspacebeforeeachsentence.Ifthestatemen... 相似文献
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Jianping 《上海大学学报(英文版)》1998,(2)
1IntroductionBecauseofthefastdevelopmentofeconomy,citiesarebecominglargerandlarger.Thetrafic,especialythepublictransportation... 相似文献