共查询到20条相似文献，搜索用时 62 毫秒
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毕天然 《新语文学习(小学作文)》2003,(8)
我喜欢昆虫，尤其爱观察蜗牛。夏天的一个中午，我和弟弟一起去捉蜗牛。弟弟问我：“姐姐，哪里才有蜗牛呢?”我笑了笑说：“蜗牛虽然在夏季才能捉到，可是它最怕热，只有在阴暗潮湿的地方才能看到它呢。”我把弟弟领到奶奶种的菜园边。扒开石头，哇!好多的蜗牛呀。弟弟说：“姐姐，你比我大，你要大蜗牛，我要小蜗牛，好不好?”我答应了。我仔细一看，大的才四个，而小的有十几个!这个贪心的弟弟啊，又让他沾光了。我把四个大蜗牛放进铺好湿沙的盒子里，而弟弟用小手把蜗牛捧回了家。我和弟弟趴在地上观察那四个大蜗牛。我让弟弟把大白菜叶… 相似文献
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1生活在非洲热带草原上的蜗牛不但要冬眠,还要夏眠。这里的夏季天气炎热、干燥,植物枯黄,此时蜗牛会缩进壳内睡觉,度过这炎热和缺少食物的日子,耐心等待雨季的到来。 相似文献
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养殖蜗牛管理简便、饲料易得、产量高、收益大,是一项很好的校园和家庭副业。本文简要介绍白肉蜗牛(系指源自褐云玛瑙螺的变异新品种,俗称白肉蜗牛)的养殖方法。 一、生态习性:白肉蜗牛喜温怕冷、喜阴怕光, 相似文献
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采用家鸡、家鸽、家兔、虎纹蛙、猪的红细胞测定法国亮大蜗牛凝集素和白玉蜗牛凝集素的凝集活性,进行糖抑制、热稳定性、pH及Ca2＋影响试验．结果表明,法国亮大蜗牛凝集素和白玉蜗牛凝集素都能凝集家鸡、家鸽、家兔、猪4种红细胞,且对兔红细胞的凝集活性最高,对蛙红细胞的凝集活性最低;两者凝集活性在pH7～8最适宜,它们均有一定的热稳定性,部分糖对蜗牛凝集素产生抑制作用,金属离子能影响蜗牛凝集素的凝集效价,蜗牛凝集素的凝集活性依赖于Ca2＋． 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
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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
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《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
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《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