题目内容
虽然Internet上的主机都可以用IP地址唯一地标识,并且通过IP地址被访问,但IP地址是数字形式的,而且很长、很难记,不便于我们平时使用。因此,我们在Internet上引入了____,它是一个将域名和IP地址相互映射的分布式数据库,能够使人更方便地访问互联网,而不用去记住那些能够被机器直接读取的IP地址数字串。
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通常用来代表政府部门域名的后缀是____。
____是近年来兴起的另一种新型网络攻击手段,黑客通过网站、电子邮件、即时通信或传真等方式,尝试窃取用户的个人身份信息。
Prior to the addition of the components to a board, solder paste needs to be added to those areas of the board where solder is required. Typically these areas are the component pads. This is achieved using a solder screen.
The board with the added solder paste is then passed into the pick and place process, the pick and place machines place large numbers of small, or large components quickly and accurately onto printed circuit boards.
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