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问题 多项选择题

下面对总量指标描述正确的是( )。

A．总量指标是统计单位标志值汇总而成的，所以必然具有价值量计算单位

B．总量指标是对总体认识的起点，是总体范围大小的直接体现

C．总量指标是相对指标、平均指标、变异指标构造的基础

D．总量指标是统计单位以数量表达和文字表达汇总而得的

E．总量指标是对于一个特定的统计总体而言的

答案

参考答案：B,C

阅读理解与欣赏

阅读下面这首古诗，完成1～2题。

春思

贾至

夜草色青青柳色黄，桃花历乱李花香。

东风不为吹愁去，春日偏能惹恨长。

1．诗的第一、二句，写出了春天景色的什么特点？

________________________________________________

2．全诗表达了诗人怎样的情感？

________________________________________________
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单项选择题

The presentation layer is concerned with the （）and semantics of the information exchanged between two systems. The processes in two systems are usually exchanging information in the form of character （）, numbers, and so on. The information should be changed to bit （） before being transmitted. Because different computers use different encoding systems, the presentation layer is responsible for （） between these different encoding methods. The presentation layer at the sender changes the information from its sender-dependent format into a common format. The presentation layer at the receiving machine changes the common format into its （） -dependent format.

The information should be changed to bit （）before being transmitted.

A．systems

B．characters

C．layers

D．streams
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