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杨宪立 《濮阳职业技术学院学报》2006,19(2):127-129
考试就要有命题,编拟命题的一个重要途径就是将已有命题认真剖析,然后改编为新的命题。常见的编拟命题的方法主要有:利用命题结论的多样性、利用逆命题、利用几何变换、利用特殊情形,推广或把原命题改编为开放型命题。 相似文献
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简易逻辑是新教材中新增内容,对教师和学生来说都是新的知识,教师对教材把握的如何,将会直接影响教学效果.现将“逻辑联结词”中,值得注意的几个问题归纳如下.1 命题与命题的否定的之间区别与联系一个命题的否命题与对一个命题进行否定两者之间既有联系又有区别,学生容易把它们混为一谈.一个命题的否命题是将这个命题的题设和结论同时进行否定所得到的新命题;而对某一命题进行否定是不改变这个命题的题设,对其结论进行否定所得到的新命题.即命题“若A,则B”的否命题是“若非A,则非B”,但对这个命题进行否定得到的命题是“若A,则非B”.因… 相似文献
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许晓虹 《数学学习与研究(教研版)》2013,(5):116
能够判断真假的语句叫命题,我们把命题的否定形式称为非命题.一个命题的条件和结论分别是另一个命题的结论的否定和条件的否定,这样两个命题叫做互为逆否命题.反证法即是证明命题的逆否命题,本文将从非命题的角度阐述反证法推出矛盾中的逻辑方法. 相似文献
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利用一个初等几何命题的结果,运用射影几何的方法得到若干射影几何命题,在通过将这些射影几何命题特殊化得到相关的初等几何命题。 相似文献
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1.典型错误剖析
错误1 认为命题的否定就是否定原命题的结论
在命题的否定中,有许多是将原命题中的结论加以否定.如命题:√2是无理数,其否定是:√2不是无理数.但据此就认为命题的否定就是否定原命题的结论就错了. 相似文献
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邱章乐 《淮南师范学院学报》2005,7(1):105-112
将经典的控制情境命题法延伸到模拟情境命题与虚拟情境命题等领域,从而构架情境命题的新理论,拓展其应用领域,为各级各类的人才选拔考试提供多元命题方法。 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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《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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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献