21世纪是一个网络的世纪，21世纪的社会是一个信息的社会。在网络中，计算机担负着信息的承载、处理和传输的任务，是网络的硬件核心，是网络的载体，而信息是网络里流通的血液，是计算机业的黄金。一个国家信息化进程发展速度的快慢，信息化水平的高低，关键取决于计算机的发 The 21st century is a century of network. The 21st century society is a society of information. In the network, the computer bears the task of carrying, processing and transmitting information, which is the hardware core of the network and the carrier of the network. The information is the blood circulating in the network and the gold of the computer industry. The pace of development of a country’s information process, the level of information technology, the key depends on the computer’s hair