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An（），serving a function similar to a physical wallet, holds credit card numbers, electronic cash, owner identification, and owner contact information and provides that information at an electronic com

A. electronic wallet
B. electronic commerce
C. third party payment
D. Internet banking

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______, businesses offer services for which they charge a fee that is based on the number of size of transactions they process.

A. In the fee-for-transaction revenue model
B. In the web catalog revenue model
C. In the traditional catalog-based retail revenue model
D. In the advertising-supported revenue model

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给定教师关系 Teacher（T_no， T_name, Dept name, Tel），其中属性 T_no、T_name、Dept_name 和 Tel 的含义分别为教师号、教师姓名、学院名和电话。用 SQL 创建一个“给定学院名求该学院的教师数”的函数如下:Create function Dept_count（Dept_name varchar（20））（） begain （请作答此空）

A. returns integer
B. returns d_count integer
C. declare integer
D. declare d_count integer

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In the （），businesses offer services for which they charge a fee that is based on the number of size of transactions they process. Some of these services lend themselves well to operating on the Web.

A. Fee-for-Transaction Revenue Model
B. Advertising-Supported Revenue Models
C. Web Catalogue Revenue Models
D. Value chain

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给定教师关系 Teacher（T_no， T_name, Dept name, Tel），其中属性 T_no、T_name、Dept_name 和 Tel 的含义分别为教师号、教师姓名、学院名和电话。用 SQL 创建一个“给定学院名求该学院的教师数”的函数如下:Create function Dept_count（Dept_name varchar（20））（请作答此空） begain （）

A. returns integer
B. returns d_count integer
C. declare integer
D. declare d_count integer

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An（），serving a function similar to a physical wallet, holds credit card numbers, electronic cash, owner identification, and owner contact information and provides that information at an electronic com

A. electronic wallet B. electronic commerce C. third party payment D. Internet banking

______, businesses offer services for which they charge a fee that is based on the number of size of transactions they process.

In the （），businesses offer services for which they charge a fee that is based on the number of size of transactions they process. Some of these services lend themselves well to operating on the Web.

A. electronic wallet
B. electronic commerce
C. third party payment
D. Internet banking