从经济观点看,提高总转化率比提高单程转化率更有利。
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YouareusingRecoveryManager(RMAN)forbackupandrecoveryoperations.YourbackupandrecoverypolicyissuchthatyouareperformingfulldatabasebackupeveryTuesdayandFriday.YouconfigureRMANusingthefollowingcommand:
RMAN>CONFIGURERETENTIONPOLICYTORECOVERYWINDOWOF4DAYS;
Allbackupandarchivedredologsgeneratedduringthecurrentweekareasfollows:
WhichofthefollowingfileswillbelistedwhenissuingtheREPORTOBSOLETEcommandonSunday?()
制备好的催化剂从生产厂家运来后直接加到反应器内就可以使用。