Which three tasks can be performed using a duplicate database? （）(Choose three.) [" Testing the backup and recovery procedures"," Testing the upgrade of an Oracle database to a new release"," Testing the effect of an application changes on database performance"," Continuously updating archive log files from the target database to support failover"]
在工程项目建设过程中，项目法人始终是以建设项目管理客体身份掌握着工程项目建设的决策权，并承担项目建设风险。
力学性能检验时，应从每批接头中随机切取（）个接头，其中（）个做拉伸试验，（）个做弯曲试验。 ["A.4，2，2 ","B.6，3，3 ","C.4，3，1 ","D.6，4，2"]
简述我国森林、林木、林地的权属及形式？
In Oracle 11g， which recommendations does the SQL Access Advisor generate？（） [" partitioning recommendations"," statistics collection recommendations"," index creation recommendations"," materialized view recommendations"," materialized view log recommendatio"]
社会促进指
