认知心理学的先驱，乔治·米勒发现人的心智极其有限，只能记忆有限的信息，人们通常把信息进行分类存储，每个类别通常不能记忆（）个以上的信息。
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Twenty database users are connected to your database. Five of the users are running long queries involving sort operations. The TEMP tablespace is the default temporary tablespace for your database. You are performing offline tablespace backups of individual tablespaces and erroneously execute the following statement： SQL>ALTER TABLSPACE temp OFFLINE NORMAL； What is the result of this statement？（）
A. The TEMP tablespace is taken offline. The users using the TEMP tablespace for sorting are disconnected after their queries complete.
B. The TEMP tablespace is taken offline. The users using the TEMP tablespace for sorting are disconnected and must re-execute their queries.
C. The TEMP tablespace is taken offline. The users using the TEMP tablespace for sorting are not disconnected， but these users must re-execute their queries.
D. The TEMP tablespace is not taken offline. The users using the TEMP tablespace for sorting are not disconnected， and their queries execute successfully.
火灾现场勘查步骤的有（）。
A. 初步勘查
B. 专项勘查
C. 剖面勘查
D. 细项勘查
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