选择题：决定局域网特性的主要技术要素包括()传输介质和()。

分组交换技术在实际应用中又可分为两类:()和()。

Regardless of their basic purposes ― B2C or B2B ― virtually all EC sites rest on the same network structure, communication protocols, Web standards and security systems.

During the Internet marketing, what possibilities can Internet be able to realize?

Despite their limitations, however, these systems may eliminate ― or significantly reduc

Protecting the confidentiality, integrity and availability of these information resources is a priority and a job responsibility for all employees at all levels of the company.