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怎样理解人的自觉活动与社会历史客观必然性的关系？

锚栓抗拔承载力现场检验可分为非破坏性检验和破坏性检验。（）

A. 正确
B. 错误

A web application uses the HttpSession mechanism to determine if a user is "logged in." When a usersupplies a valid user name and password， an HttpSession is created for that user. The user has access tothe application for only 15 minutes after logging in. The code must determine how long the user has beenlogged in， and if this time is greater than 15 minutes， must destroy the HttpSession. Which method in HttpSession is used to accomplish this？（）

A. Getcreationtime
B. Invalidateafter
C. Getlastaccessedtime
D. Getmaxinactiveinterval

矫正车身上钣金构件的伸胀而引起的隆起变形，若使用收缩锤和收缩垫铁，应同时并用。

A. 正确
B. 错误