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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 characters in B

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出自：Oracle认证

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