化学反应器的空时就是反应物料在反应器内的停留时间,用来表明反应时间长短。
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对于连串反应,若目的产物是中间产物,则反应物转化率越高其目的产物的选择性越低。
从经济观点看,提高总转化率比提高单程转化率更有利。
YouareusingRecoveryManager(RMAN)forbackupandrecoveryoperations.YourbackupandrecoverypolicyissuchthatyouareperformingfulldatabasebackupeveryTuesdayandFriday.YouconfigureRMANusingthefollowingcommand:
RMAN>CONFIGURERETENTIONPOLICYTORECOVERYWINDOWOF4DAYS;
Allbackupandarchivedredologsgeneratedduringthecurrentweekareasfollows:
WhichofthefollowingfileswillbelistedwhenissuingtheREPORTOBSOLETEcommandonSunday?()