You have enabled backup optimization for the RMAN environment. Identify two criteria on which RMAN will skip the file, if it has already been backed up.（） (Choose two.) [" The data file backup is done with multiple channels"," The data files is in the read-write mode after being backed up in the read only mode"," The backup was taken after the data files was taken offline-normal or is in the read only mode"," The data file backup complies with the back retention policy and the backup duplexing feature"]
Which tablespaces are mandatory in an Oracle database for it to be operational（） ["Undo tablespace","USERS tablespace","SYSAUX tablespace","SYSTEM tablespace","Temporary tablespace"]
中学教师应如何做好班级管理与教育活动？
抵押是合同当事人用自己一定的财产来向对方保证自己履行合同义务的担保形式。
What are two circumstances for which it may be advisable to use the silent uninstallation method instead of an interactive method？（） [" The Administrator is unable to successfully export DISPLAY to a remote server."," IBM Tivoli Workload Scheduler is installed on a server for which there is no console access."," DNS is not working properly and the server cannot be accessed remotely to run the uninstallation script."," TCP on the server on which IBM Tivoli Workload Scheduler is installed is configured for half-duplex rather than full-duplex."," The remote IBM Tivoli Workload Scheduler server is multi-homed， thus the return connection to IBM Tivoli Workload Scheduler cannot be established thereby requiring the use of the silent uninstaller."]
嗜冷微生物为什么能在低温环境生长繁殖？
