人工照明有几种方法?说明良好照明设计中所考虑的因素?
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粮情检测系统防病毒要求,操作人员要定期检测计算机病毒,发现系统感染病毒时,应立即消除病毒;还应定期对检测数据进行备份,确保检测数据的安全;对插入测控计算机的软盘和光盘应先经检测,确认无病毒后,方可操作使用。
A. 正确
B. 错误
全局目录必须和拥有域命名主控角色相同的域控制器上运行。
A. 正确
B. 错误
You are working on an instance started using the SPFILE. You want to move the Flash Recovery Areaof your database to a new location. You want the Flashback log files to be stored in the new location. Given below are the steps to accomplish the task in random order: 1)Shut down the instance. 2)Change the value of the DB_RECOVERY_FILE_DEST initialization parameter to a new value. 3)Execute the ALTER DATABASE FLASHBACK OFF command. 4)Start up the instance and mount the database. 5)Execute the ALTER DATABASE FLASHBACKON command. 6)Open the database. Select the correct order in which these tasks need to be performed. ()
A. 2,1,4,3,5,6
B. 1,4,3,2,6,5
C. 1,4,2,6,3,5
D. 3,2,1,4,5,6