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Which two statements are true regarding working with dates?（）
A:The default internal storage of dates is in the numeric format 
B:The default internal storage of dates is in the character format 
C:The RR date format automatically calculates the century from the SYSDATE function and does not allow the user to enter the century 
D:The RR date format automatically calculates the century from the SYSDATE function but allows the user to enter the century if required

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出自：Oracle认证

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