【单选题】Take a hat with you in case the sun is very hot.
【简答题】Fill in the blanks with words or phrases from the box below. Change the form where necessary. challenge creativity infection predict screen pursuit sympathy all the way by now ...
【判断题】身份验证是验证客户端Wed网站身份的行为。
【判断题】在UNIX/Linux系统中,可以认为操作系统用了三张表来描述一个打开的文件