公共关系的英文拼写是（）。 ["Public Relations","Public Relation","Publications Relations","Publications Relatio"]
Users of your web application have requested that they should be able to set the duration of their sessions.So for example， one user might want a webapp to stay connected for an hour rather than the webapp’sdefault of fifteen minutes； another user might want to stay connected for a whole day. Furthermore， youhave a special login servlet that performs user authentication and retrieves the User object from the database. You want to augment this code to set up the user’s specified session duration. Which codesnippet in the login servlet will accomplish this goal？（） ["User user = \/\/ retrieve the User object from the database session.setDurationInterval（user.getSessionDuration（））；","User user = \/\/ retrieve the User object from the database session.setMaxDuration（user.getSessionDuration（））；","User user = \/\/ retrieve the User object from the database session.setInactiveInterval（user.getSessionDuration（））；","User user=\/\/retrieve the User object from the database session.setDuration（user.getSessionDuratio（））；","User user = \/\/ retrieve the User object from the database session.setMaxInactiveInterval（user.getSessionDuration（））；"]
通用的六种硅酸盐水泥初凝时间不得早于（）。 ["A.30min ","B.45min ","C.20min ","D.25min"]
一个FTP服务器上只能建立一个FTP站点。
有结构的问题的解决过程包括（）。 ["建立问题表征","搜寻解法","执行解法","解法评价","启发"]
四项基本原则是坚持（）、坚持（）、坚持（）、坚持（）。
