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多項(xiàng)選擇題

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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