问题：
[单选题] （请作答此空）是指计算机CPU在单位时间内输出的脉冲数，它在很大程度上决定了计算机的运行速度。（ ）是指计算机的运算部件能同时处理的二进制数据的位数，它决定了计算机的运算精度。
A、时钟频率B、字长C、可移植性D、数据处理速率问题：
[单选题] ______,businesses offer services for which they charge a fee that is based on the number of size of
A、In the fee-for-transaction revenue modelB、In the web catalog revenue modelC、In the traditional catalog-based retail revenue modelD、In the advertisin...问题：
[单选题] ______has many elements:text,audio sound,static graphics images,animations,and video.
A、MultimediaB、DatabaseC、FileD、Document问题：
[单选题] ______is a file that contains metadata-that is,data about data.
A、DocumentB、Excel tableC、DatabaseD、Data dictionary问题：
[单选题] ______is a list of items that are accessible at only one end of the list.
A、A treeB、An arrayC、A stackD、A queue问题：
