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Given two different character sets （A and B）， which of the following must be true for A to be considered a strict superset of B？（）
A: A must contain all of the characters defined in B
B: A must be Unicode
C: The encoded values in A must match the encoded values in B for all characters defined in B 
D: A must be a multibyte character set
E: The encoded values in A must match the encoded values in B for all numeric and alphabetic character

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出自：Oracle认证

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