可燃性混合物的惰性介质含量越高其爆炸危险性()。A.越小 B.越大 C.无关 D.无

题型:单项选择题

问题:

可燃性混合物的惰性介质含量越高其爆炸危险性()。

A.越小

B.越大

C.无关

D.无规律

考点:安全生产技术第一节火灾爆炸事故机理第一节火灾爆炸事故机理题库
题型:单项选择题

下列鉴别试验中属于苯巴比妥的鉴别反应是()

A.硫酸反应

B.甲醛—硫酸反应

C.戊烯二醛反应

D.二硝基氯苯反应

E.与碘液的反应

题型:单项选择题

有以下程序: Private Sub Form_Activate()   For j=1 to 3   x=3   For i=l to 2     x=x+6     Next   Next   Print x End Sub 程序运行后,窗体上显示的结果为______。

题型:单项选择题

下面一段文字有多处错误,请按要求修改。(6分)

大慨没有一个人敢保证,自己在以往从前的日子里能够始终做到表里如一。哪一个人未曾说过假话呢?哪一个民族没有因为种种原因而一度走了弯路呢?也恰恰是因为有了这一切,才有了勇于忏悔的个人、国家和民族,才有了忏悔和反思后的腾飞。

小题1:文中有一个错别字,找出来予以改正。

     ”改为“     

小题2:文中有一处语义重复,应删去的是              

小题3:文中有一个句子的词序不当,应调整为                           

                          

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.

According to this passage, the best way to build a good vocabulary is().

A.to remember a lot

B.to read a great deal

C.to take part in a lot of good talks

D.both B and C

题型:单项选择题

在下面的IP地址中,()属于C类地址

A.141.0.0.100 

B.197.234.111.100 

C.5.5.5.100 

D.23.46.92.100

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