写一篇英语作文(我喜欢吃什么,我不喜欢吃什么。)

如题所述

Hello,I am Dale.I like hamburgers and apples for breakfast.But I don't like bread and milk.For lunch,I like rice、fruit salad and chicken.I don't like noodlles.For dinner,I like porridge and vegetable.And I don't like eggs.
层次模型特点:用一颗“有向树”的数据结构来表示表示各类实体以及实体间的联系,树中每一个节点代表一个记录类型,树状结构表示实体型之间的联系。

网状模型特点:用网络结构表示实体类型及其实体之间联系的模型。

层次模型优缺点:结构清晰,结点间联系简单,只要知道每个结点的双亲结点,就可以知道整个模型结构。但是查询子女结点必须通过双亲结点,因为层次模型对任一结点的所有子树都规定了先后次序,这一限制隐含了对数据库存取路径的控制。

网状模型优缺点:能够更为直接地描述现实客观世界。可表示实体间的多种复杂联系。但是结构比较复杂,其数据定义语言(DDL)、数据操作语言(DML)复杂,用户不容易使用。而且应用环境越大,数据库的结构就变得越复杂,不利于最终用户掌握。

扩展资料

网状模型取消了层次模型的不能表示非数状结构的限制,两个或两个以上的结点都可以有多个双亲结点,则此时有向树变成了有向图,该有向图描述了网状模型。

层次模型的数据操纵主要有查询、插入、删除和更新。进行插入、删除、更新操作时要满足层次模型的完整性约束条件。进行插入数据时,如果没有相应的双亲结点值就不能插入它的子结点值。进行删除数据时,如果删除双亲结点值,则相应的子结点值也被同时删除
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第1个回答  2013-10-20
嗨,我叫魏嘉哲,我喜欢吃米饭但是我不喜欢吃西红柿。我的朋友喜欢吃Hi, my name is Wei Jiazhe I like to eat rice, but I do not like to eat tomatoes. My friends like to eat chicken but he does not like to eat carrots.鸡肉但是他不喜欢吃胡萝卜。本回答被网友采纳
第2个回答  2021-04-14
以我喜欢吃什么,我不喜欢吃什么,为主题写一篇英文作文,必须要把自己喜欢和不喜欢吃的食物列举出来,然后采用正确的时态和流利的语言,才可以让文章的书写更加流畅而准确。
正确记忆单词,才可以正确使用单词,从而让文章的书写更加精准,而流畅。
1 阅读记忆法 也就是把词汇的记忆融入阅读之中,在看一篇文章的时候,遇到不认识的单词先做记号,并猜测它们的含义,等到把全文看完后再从字典上把它们的意思找出来。
这种方法不枯燥,记得比较牢,但缺点是记忆的词汇量比较少,而且耗时也比较长,不适合想求速成的同学。
2 笔记记忆法 我的灵感来源于一篇文章,说某君从不背书,只抄书,每一本书都被他 抄了几遍,这样最后全数的内容都印在了他的脑海中。
这大概是书上的铅字经自己用笔抄下来后,好象就成了自己的东西,对自己就没有排斥反应了。
具体做法是找一本笔记本,把它的一页按中间对折,然后从字典上把英汉意思抄上去,英语单词或词组抄在左边,汉语意思抄在右边。
然后对所有的词汇背三遍,先英汉对照背一遍,然后分别只看英文或只看汉语解释背一遍(把页面折起来,使自己看不到英文或中文部分,以免受干扰)。
这种方法记忆的量大而且比较牢靠,只是需要不怕累的人才能做到。本回答被网友采纳
第3个回答  2013-10-20
I like eat fruit and vegetables because it good for our healthy.We must keep fit.
And eat fast food,sweet snacks less,like hamburgers,cakes and sweets.
第4个回答  2013-10-20
凯特妈妈的生日在这个星期六

写一篇英语作文(我喜欢吃什么,我不喜欢吃什么。)
嗨,我叫魏嘉哲,我喜欢吃米饭但是我不喜欢吃西红柿。我的朋友喜欢吃Hi, my name is Wei Jiazhe I like to eat rice, but I do not like to eat tomatoes. My friends like to eat chicken but he does not like to eat carrots.鸡肉但是他不喜欢吃胡萝卜。

写一篇英语作文(我喜欢吃什么,我不喜欢吃什么。)
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