共查询到20条相似文献，搜索用时 78 毫秒
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吴赛瑛 《中学数学研究(江西师大)》2008,(6):20-21
文[1]介绍了相似椭圆的、一组性质,文[2]将文[1]的性质推广到双曲线上,并增加了一些优美性质.笔者读后深受启发,考虑抛物线上是否有类似的性质?答案是肯定的.故本文给出一类全等抛物线的一组性质,叙述如下: 相似文献
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本文研究了粗糙模糊集的截集性质,粗糙模糊集的上、下近似算子具有保截集性质.在此基础上给出了粗糙模糊集的分解定理,证明了模糊上、下近似算子是其限制在经典集合上算子的典范扩张.最后,利用截集性质简化了模糊集的粗糙度和精度的计算,并给出一个应用实例. 相似文献
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《洛阳师范学院学报》2017,(2):26-28
对于Riemann积分的计算,高等数学教材中归纳出了奇、偶函数在对称区间上的两个运算性质.本文在此基础上,推出对称区间[-a,a]上任意连续函数的积分性质,以及任意区间[a,b]上连续函数积分的几个性质,并应用这些性质求解有关连续函数的Riemann积分问题. 相似文献
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陈定均 《数学学习与研究(教研版)》2014,(9):113
在数学分析中,有我们已经熟知的结论:闭区间上的连续函数一定可积.但对于开区间上的连续函数有没有类似的性质呢?本文探讨了有限开区间上连续函数的性质,有限开区间上函数可积的充分条件,得出了开区间上连续函数可积的充要条件. 相似文献
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一、创设情境,导入新课
师:请同学们回顾一下,我们学过了哪些性质?
生:商不变的性质、小数的性质、分数的基本性质.
师:上节课我们认识了比,比有没有性质?比的性质又会是什么内容?请同学们猜想一下.…… 相似文献
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一、创设情境,导入新课
师:请同学们回顾一下,我们学过了哪些性质?
生:商不变的性质、小数的性质、分数的基本性质.
师:上节课我们认识了比,比有没有性质?比的性质又会是什么内容?请同学们猜想一下.…… 相似文献
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姜爱林 《陕西理工学院学报(社会科学版)》2002,20(3):1-7
首先给出偏序集拟阵上秩的概念 ,并由此产生了偏序集拟阵间 (秩 )强映射的概念 ,这种强映射满足交换性质 .然而 ,之后给出的 (平坦 )强映射却不满足交换性质 .说明拟阵间的强映射之交换性质是不能直接推广到偏序集拟阵上 . 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献