单项选择题

YouareperforminganincompleterecoverybecausesomeimportanttableshavebeendroppedandpurgedfromtheRecycleBin.WhichclausecanyouNOTusetoperformtheincompleterecoverybyusingtheRMANutility？（）

A.UNTILCANCEL
B.UNTILSCN
C.UNTILSEQUENCE
D.UNTILTIME
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单项选择题
Youissuedthefollowingstatement：SQL>ALTERDATABASEBACKUPCONTROLFILETOTRACE；Whatwillbetheresultofissuingthestatement？（）
A.Thecontrolfilewillbemultiplexed.
B.Thecontrolfilewillberecreated.
C.ThescriptcontainingtheCREATECONTROLFILEstatementwillbecreated.
D.Thebinarybackupofthecontrolfilewillbecreated.
单项选择题
Whichstatementistrueaboutmouseevents?（）
A.ThecursorstylecanbesettoCAUTION.
B.Double-clickingamousebuttoncanpotentiallyfiresixmouseeventtriggers.
C.ThevaluesfortheSYSTEM.MOUSE_BUTTON_PRESSEDsystemvariablecanonlybe1or2.
D.Clickanddouble-clickbuttonactionscanonlydetectifthemouseispositionedinanitem.
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