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问题 单项选择题

关系数据库是表的集合。对视图进行查询，本质上就是对从 (7) 中导出的数据进行查询；支持数据库各种操作的软件系统称为 (8) 。

A．数据库系统

B．文件系统

C．数据库管理系统

D．操作系统

答案

参考答案：C

解析： 关系数据库是表的集合。对视图进行查询，本质上就是对从一个或若干个基本表中导出的数据进行查询；支持数据库各种操作的软件系统称为数据库管理系统。

单项选择题

Deflation is an economic theory relating changes in the price levels to changes in the quantity of money. In its developed (1) , it constitutes an analysis of the (2) underlying inflation and deflation. As (3) by the English philosopher John Locke in the 17th century, the Scottish (4) David Hume in the 18th century, and (5) , it was a weapon (6) the mercantilists, who were thought to equate wealth with money. If the (7) of money by a nation merely raised (8) , argued the quantity theorists, then a "favourable" balance of trade, (9) desired by mercantilists, would increase the supply of money but would not in-crease (10) . In the 19th century the quantity theory (11) to the ascendancy of free trade over protectionism. In the 19th and 20th centuries it played a part in the (12) of business cycles and in the theory of foreign (13) rates.

The (14) theory came under attack during the 1930s, (15) monetary expansion seemed ineffective in combating deflation. Economists argued that the levels of investment and government spending were more important than the money supply in determining economic activity.

The tide of opinion (16) again in the 1960s, when experience (17) post-World WarⅡ inflation and new empirical (18) of money and prices— (19) A Monetary History of the United States (1963) by Milton Friedman and Anna Schwartz—restored much of the quantity theory’ s lost prestige. One implication of this theory is that the size of the stock of money must be considered when shaping governmental policies (20) to control prices and maintain full employment.

8（）

A.amounts

B.prices

C.levels

D.ranges
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单项选择题

企业选择目标市场的基础和前提是（）。

A、市场定位

B、市场细分

C、营销组合

D、市场调研
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