共查询到20条相似文献，搜索用时 62 毫秒
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先查气密再装锌,后将硫酸加其中;待到大量氢气生,试管收集采验纯。还原开始先通氢,排尽空氛再点灯;由黑变红先撤灯,试营冷却再停氢;先点后通合爆炸,先停后撤去氧化。实验室制取氢气并还原氧化铜顺口溜@王积斌!陕西商南县@陈小兰!陕西商南县 相似文献
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《冬暄草堂师友笺存》收有浙江乌程(今湖州)诗人施补华致陈豪的书札五通，为《施补华集》和其他文集所未收。经考证，此五通书札皆作于光绪二年(1876),对于我们了解光绪二年施补华军旅期间的生活情状及其与陈豪、凌霞等人的交往，以及左宗棠克服西疆等史实，均有较大的文献价值。 相似文献
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张志烈 《阿坝师范高等专科学校学报》2014,(1):50-55
在当今文化强国的背景下,"弘扬东坡精神,传播东坡文化"具有更加重大而深远的意义。东坡文化精神可以用四句话来概括:一是爱国爱民、奋励当世的崇高理想;二是求实求真、探索创新的认识追求;三是信道直前、独立不惧的处事原则;四是坚守节操、潇洒自适的生活态度。东坡文化的传承需要对苏轼全部著述进行细致入微的整理,《苏轼全集校注》对宋代大文豪苏轼的诗、词、文进行了全面的校勘、注释、编年、辑佚、集评,且自成体例,做到"五通",即通收、通校、通注、通编、通评。只有把握苏轼与中国文化演进过程中不同阶段的文化巨人在文化精神与艺术精神的相通之处(以杜甫与苏轼为例),把东坡文化视为传统文化的重要组成部分,才能更好地传承东坡文化。 相似文献
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本刊1986年第6期刊登拙作《分式线性函数所定义的数列》(以下简称文)给出数列的通项,本短文在此基础上研究迭代数列的调和性、周期性及收剑性的判定等问题.为行文方便先作简要回顾. 相似文献
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《安徽教育学院学报》1995,(1)
本文运用变换通项法给出了n阶常系数非齐次线性递归方程的。一个降阶定理,从而理论上把一般n阶常系数非齐次线性递归方程转化为一些一阶问题求解,并指出了若干类常系数线收递归方程的公式解的存在性. 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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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
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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