一个城市的总人口为2500万,其包含5个城区,每个城区的人口大约在500万左右,计划

题型:单项选择题

问题:

一个城市的总人口为2500万,其包含5个城区,每个城区的人口大约在500万左右,计划进行一项抽样调查,经计算可知对该城市总人口进行推断的样本量为n。如果还想分别对5个城区的人口进行精确地推断,则样本量应该是()。

A.n

B.5n

C.3n

D.不能确定

考点:市场调查与预测市场调查与预测题库
题型:单项选择题

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Students will need to use all of their skills in order to understand the reading selections in Reader's

Choice. 

     1_____ These selections provide practice on employing different reading skills to get the message

of the writer. They also give students practice in four basic reading skills: skimming, scanning, reading

for thorough comprehension, and critical reading.

     Skimming involves reading quickly through a text to get an overall idea of its contents. This kind of

rapid reading is suitable when you are trying to decide if careful reading is desirable or 2_____

     Like skimming, scanning is also quick reading. However, in this case the search is more concentrated.

3_____ When you read to find a particular date, or number you are scanning.

     Reading for thorough comprehension is carefully reading in order to understand the total meaning of

the passage. At this level of comprehension the reader is able to summarize the author's ideas 4_____

     Critical reading demands that a reader makes judgments about what he or she reads. This kind of read

requires posting arid answering questions such as "5_____", "Do I share the author's point of view?" and

"Am I convinced by the author's arguments and evidence?"

A. Does my own experience support that of the author?

B. Reader's Choice is one of the most popular magazines in the world.

C. but has not yet made a critical evaluation of those ideas.

D. The book contains many types of selections on a wide variety of topics.

E. To scan is to read quickly in order to find out specific information.

F. Do I know about the author? G. when there is no time to read something carefully.

题型:单项选择题

某二级公路工程中拟修建一座3跨30m的预应力T形梁桥,平均桥墩高30m,该桥属于()。

A、特大桥

B、大桥

C、中桥

D、小桥

题型:单项选择题

强电控制电缆的额定电压不应低于( )。

A.250V;
B.450/750V;
C.600/1000V;
D.800/1200V。

题型:单项选择题

作为现代信息处理的主要工具,信息系统是一个以提供信息服务为主要目的的数据密集型、人机交互的计算机应用系统。

题型:单项选择题

里昂惕夫之谜

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