共查询到20条相似文献，搜索用时 62 毫秒
1.
通过对金属钠包裹方法的改进，使钠与水反应实验操作得到简化，比原来的实验操作方法更加简单易行，并且实验的安全性得到了加强，消除了实验安全的隐患． 相似文献
2.
蔡万玲 《新疆教育学院学报》2004,20(2):44-45
微型化学实验的显优点使它在国际上得到广泛应用，笔对微型实验进行两年多的学习实践，认为微型化学实验有利于探究式学习，得到学生欢迎，值得推行。 相似文献
3.
徐海斌 《湖州师范学院学报》2000,22(3):31-33
从沉积在液体基底上银原子的凝聚实验规律出发，对凝聚机理进行研究，提出了凝聚速率的几率模型，给出了由该几率模型所得到的结论，并对不同沉积速率下所得到的结论与实验数据进行比较，得到与实验数据相一致的结果。 相似文献
4.
张勰 《中学化学教学参考》2006,(1):51-52
高一教材学生实验“实验一化学实验基本操作（一）”中制取氧化铜时，实验步骤出现了一些问题：有些学生将NaOH溶液向CuSO4溶液中加入时，得不到期望的蓝色沉淀Cu（OH）2，而是得到了蓝绿色物质或深蓝色物质；有些学生加热很长时间也得不到黑色的CuO，而是得到了蓝绿色的物质；有些学生加热得到了黑色的氧化铜，但量很少。那么导致以上问题的原因是什么呢？为得到纯净的氧化铜，我进行了下列的实验研究。 相似文献
5.
郑建荣 《中学物理教学参考》2000,29(3):38-38
高中《物理》(必修)第一册第四章学生分组实验“验证机械能守恒”，对于实验数据分析，教材要求学生选择点迹清楚且第一、二点间距离接近2mm的纸带进行实验结果分析．但在实验中发现好多组学生不能得到这样的纸带，有的学生得到的纸带第一、二点距离在3～4mm，学生得到这样的纸带后， 相似文献
6.
7.
植物学教学涉及大量实验，通过学生亲自动手参与实验，不仅能激发兴趣、巩固知识，而且能使多种能力得到培养，但是教材所采用的很多实验材料由于本身的局限性，不易得到，难以满足当前的教学需要。在教学实践中，我发现一种垂手可得而且效果很好的多用实验材料——大叶黄杨。 相似文献
8.
数学实验教学中，学生通过“创设情境，提出问题——实验探索，形成结论（实验感知，形成猜想——实验探索，验证猜想——合作交流、归纳绪论）——实践运用．解决问题——总结反思．评价体验”的基本流程主动地进行观察、实验、猜想、验证、推理与交流等数学活动．改变了学习教学的方式：由“听数学”变为“做数学”；由“看演示”变为“动手操作”；由“机械接受”变为“主动探究”。学生在数学实验活动中。主体作用得到充分发挥，体验到发现知识的乐趣。探究能力得到提高．实践能力得到增强，创新能力得到培养，思维能力得到发展。 相似文献
9.
本文以培养学生创新能力为目标，长期开展实验教学和实验管理体系的创新研究与实践，使得教学内容、方法得到改进，实验管理上了台阶，学生创新能力得到了培养，教学和管理取得了初步成果。 相似文献
10.
重视生物学实验教学，从实际前的准备，实验过程中的指导、实验效果的检查等几个环节，做到精心组织、认真准备、使学生的能力得到全面的培养，高师生物学实验教学质量得到有效提高。 相似文献
11.
12.
《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
13.
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
14.
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
15.
16.
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
17.
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
18.
正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
19.
《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
20.
《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献