A system administrator decides to review the system error log after installing new hardware. Which of the following is the correct command to use？（） errpt。 syslog。 prtdiag。 errlogger。
104型制动机的紧急制动波速最大约为（）。 160m／s。 180m／s。 190m／s。 210m／。
Examine the following RMAN command: Which two statements are true regarding the backup taken by using the above RMAN command?（） Only data files and the control file are backed up.。 Archived redo logs are backed up only I f the database is open during the backup.。 The backup is deleted after one day, regardless of the default retention policy settings.。 The backup becomes obsolete after one day, regardless of the default retention policy settings.。
An administrator attempted to run a sar -u report and received the following error： sar： 0551-201 Cannot open /var/adm/sa/sa12. Which of the following should be scheduled in adm’s crontab to enable sar reporting（） sar。 sa1。 vmo。 iostat。
城市社会学与社会学的关系。
海洋微生物中是雪卡毒素的来源包括（）。
