有关处方药与非处方药销售，下列说法正确的是（）A.处方药不得开架自选销售 B.药品批

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

How does the developer of a large database system achieve (1) and data independence How does the developer make certain that stored items are (2) and do not simply disappear in the immensities of the database, as if in quicksand

One solution is to set up a (3) system, in which all data (the internal level), all records and files (the conceptual level), and all user interfaces (the external level) are controlled by one central programming group. This may seem the most useful solution. But worldwide enterprises such as the meteorological and satellite tracking networks, IBM, and General Motors gather and record information at a very large number of locations. To stay flexible and avoid top - heaviness, such an organization might want to avoid excessive centralization.

A centralized system is (4) , but it may not be responsive to user needs. This is particularly true in a large organization - the worldwide meteorological network, for example, Data-gathering methods in the Himalayas, the equatorial jungles are different in very possible way. It is reasonable to believe that the best choices for the corresponding data storage and access structures ought to be just as different. A centralized database system would not (5) such differences.

5（）

A．tolerate

B．accommodate

C．contain

D．accept

Linda is fond of playing ______violin while Della is interested in listening to ______music.

A: /; the B. the; a C. a the D. the; /

关于冯·诺依曼原理，以下叙述错误的是( )。

A．硬件组成分为输入设备、输出设备、运算器、控制器、存储器五个部分

B．计算机的工作过程由存储程序控制

C．程序和数据表示采用二进制

D．计算机采用晶体管元器件制造

三层结构防腐层中胶粘剂的作用是（）。

A.增加防腐层与金属的粘接力

B.增加环氧树脂与聚乙烯的粘接力

C.增加防腐层的厚度

D.增加防腐层的机械强度

水利工程中，渗水抢护的基本原则是（）。

A.前排后堵

B.前堵后排

C.前截后导

D.前导后截