排列图法是利用排列图寻找工程质量主次问题的一种有效方法，实际_爱下问搜题

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问题多项选择题

排列图法是利用排列图寻找工程质量主次问题的一种有效方法，实际应用中，通常按累计频率划分为( )。

A．0～60%

B．0～80%

C．60%～90%

D．90%～100%

E．80%～90%

答案

参考答案：B,D,E

解析：排列图法是利用排列图寻找工程质量主次问题的一种有效方法，实际应用中，通常按累计频率划分为(0～80%)、(80%～90%)、(90%～100%)三部分，与其对应的问题分别为A、B、C三类。A类为主要问题，B类为次要问题，C类为一般问题。排列图可以形象、直观地反映工程质量主次问题。

解答题

陈林上学期期末考试成绩：语文80分，音乐92分，体育81分，美术85分，数学成绩比五科平均成绩高6分．请你算一算陈林的数学成绩和五科平均成绩分别是多少？

完形填空

There are about fifteen hundred languages in the world. But 36 a few of them are very   37 .English is one of these. Many, many people use it, not only in England and the U.S.A., but in other parts of the world. About 200,000,000 speak it as their own language. It is difficult to say how many people are learning it as a 38 language. Many millions are 39   to do so. Is it easy or difficult to learn English? Different people may have different   40   Have you ever   41  ads of this kind in the newspapers or magazines? "Learn English in six weeks, or your 42  back..." "Easy and funny! Our records and tapes   43  you master your English in a month.   44   the first day your   45  will be excellent. Just send …"Of course, it never    46  quite like this.
The only language that seems easy to learn is the mother tongue. We should   47  that we all learned our own language well when we were    48 . If we could learn English in the same way, it would not seem so difficult.   49   what a small child does. He listens to what people say. He tries what he hears. When he is using the language, talking in it,   50 in it all the time. Just imagine how much 51  that gets!
So it is  52 to say that learning English is easy, because a good command of English   53 upon a lot of practice. And practice needs great effort and   54  much time. Good teachers, records, tapes, books, and dictionaries will   55 . But they cannot do the student's work for him.（词数278）

D．pronunciation