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什么是客户身份识别制度？

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如果地面的气压中心和温度中心不重合，则气压系统的轴线就会倾斜，低压中心随高度增加向暖区倾斜，高压中心而向冷区倾斜。

A. 正确
B. 错误

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钢丝绳索表面不得有磨损、断股现象，直径不得少于（）。

A. 3mm
B. 4mm
C. 5mm
D. 6mm

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纸质书前期是写本，（）开始出现刻本，（）以后基本上是刻本，在这个过程中，纸质书的形式大致有卷轴装（卷子）、旋风装（龙鳞装）、经折装、梵夹装、蝴蝶装、包背装和现在常见的线装。其中卷轴装基本上是写本，旋风装、经折装、蝴蝶装写刻皆有，包背装和线装全为刻本。

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Your database instance is configured with automatic undo management and the UNDO_RETENTIONparameter is set to 900 seconds. You executed the following command to enable retention guarantee: SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE; What effect would this command have onthe database（）

A. The extents in the undo tablespace retain data until the next full database backup.
B. The extents containing committed undo in the undo tablespace are not overwritten for at least 15 minutes.
C. The extents containing committed data in the undo tablespace are not overwritten until the instance is shutdown.
D. The extents containing committed undo in the undo tablespace are transferred to Flash Recovery Areabefore being overwritte

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