在下列关于视图的叙述中,正确的一条是( )。A.当修改某一视图时,导出该视图的基本表

题型:单项选择题

问题:

在下列关于视图的叙述中,正确的一条是( )。

A.当修改某一视图时,导出该视图的基本表也随之被修改

B.视图一旦建立,就不能被删除

C.当某一视图被删除后,由该视图导出的其他视图也将被自动删除

D.若导出某视图的基本表被删除了,该视图不受任何影响

考点:计算机等级考试信息管理技术三级信息管理技术笔试42
题型:单项选择题

标志着和谈之门被国民党全部关闭、国共关系彻底破裂的是( )

A.校场口惨案
B.下关惨案
C.国民党大举进攻中原解放区
D.国民党逐出中共驻南京、上海、重庆三地代表及工作人员

题型:单项选择题

口呼吸会出现的错,不正确的是()

A.牙弓狭窄

B.腭盖降低

C.前牙前突

D.前牙拥挤

E.下颌后缩

题型:单项选择题

(四)

The average person learns most of the 30000 ~40000 words whose meanings he or she recognizes by hearing them or getting familiar with them in the context or simply absorbing them without conscious effort. The best way to build a good vocabulary, therefore, is to read a great deal and to participate in a lot of good talks. There are relatively few words that we learn permanently by purposefully referring to dictionaries or keeping word lists. However, even those extra few are of value, and no one will make a mistake by working on developing a larger vocabulary. Here are some suggestions of how to do it.

Read plenty of good books. When you come across a new word, or a new meaning of an old word, stop and see if you can understand it from its context. If you can’t, and if you can manage without interrupting the thought of the book too much, look it up in a dictionary or ask somebody and then repeat its meaning to yourself a couple of times, If you are really conscientious, write the word and its meaning in a personal vocabulary list—preferably using it in a sentence, or you can keep a special vocabulary notebook. Go over the list from time to time. Further, try to use a new word in writing or conversation a few times over the next several days.

Listen to good talks and be alert to new words you hear or to new meanings of words you already know. Then treat them just as you treat the new words you read.

Learn and be alert to the parts of words: prefixes, suffixes and roots. Knowing them enables you to make intelligent guesses about the meaning of words.

If you are studying a foreign language, be alert to words in that language which relate to words in English. English has inherited or borrowed much of its vocabulary of 500000~600000 words from Latin, Greek, French, Spanish and German.

When you meet a new word in reading, what should you do()

A.Guess its meaning.

B.Ask somebody.

C.Look it up in a dictionary.

D.All of the abov

题型:单项选择题

羊水过多是如何界定的()

A.妊娠期间羊水量超过500ml

B.妊娠期间羊水量超过1000ml

C.妊娠期间羊水量超过1500ml

D.妊娠期间羊水量超过3000ml

E.妊娠期间羊水量超过2000ml

题型:单项选择题

相对于桥接技术,二层以太网交换机有哪些特点()

A.桥接技术和交换技术都执行数据转发,但转发机制不同

B.数据交换在OSI参考模型高层实现

C.相对于桥接技术,交换技术缺乏灵活性

D.桥接技术基于硬件实现,交换技术基于软件实现

E.二层以太网交换机具有较低的延迟

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