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连续精馏预进料时,先打开放空阀,充氮置换系统中的空气,以防在进料时出现事故。

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YouareusingRecoveryManager(RMAN)witharecoverycatalogtobackupyourproductiondatabase.Thebackupsandthearchivedredologfilesarecopiedtoatapedriveonadailybasis.Becauseofmediafailure,youlostyourproductiondatabasecompletelyalongwiththerecoverycatalogdatabase.Youwanttorecoverthetargetdatabaseandmakeitfunctional.Youcouldconsiderperformingthefollowingstepstoaccomplishthistask:
1)Restoreanautobackupoftheserverparameterfile.
2)Restorethecontrolfile.
3)StartthetargetdatabaseInstance.
4)Mountthedatabase.
5)Restorethedatafiles.
6)OpenthedatabasewiththeRESETLOGSoption.
7)Recoverthedatafiles.
8)SetDBIDforthetargetdatabase
Whichoptionillustratesthecorrectsequencethatyoumustuse?()

在二元溶液的x-y图中,平衡线与对角线的距离越远,则该容易就越易分离。

精馏操作时。塔釜温度偏低,其他操作条件不变,则馏出液的组成变低。

筛孔塔板易于制造,易于大型化,压降小,生产能力高,操作弹性大,是一种优良的塔板。

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