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Upon starting your database, you receive the following error: You can choose from the following steps: 1.Restore the database datafiles. 2.Issue the alter database clear unarchived logfile group 1 command. 3.Issue the alter database open command. 4.Issue the alter database open resetlogs command. 5.Recover the database using point-in-time recovery. 6.Issue the Startup Mount command to mount the database. 7.Back up the database. Which is the correct order of these steps in this case?()
在G.652光纤的1550nm窗口处,光纤的色散系数D为正值,光载波的群速度与载波频率成正比。()
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脑血栓形成最常发生于下述哪条动脉?( )
地面信号显示一个绿灯时,4信息移频发送的低频频率是()Hz。
下列颅脑损伤具有典型中间清醒期的临床表现的是()。
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