单项选择题
char a=0xdb,则~a的值为()
A.0xdb B.0xbd C.0x24 D.0x42
A.0x12 B.0x21 C.0x34 D.0x43
A.0x12 B.0x21 C.0x78 D.0x87
A.1 B.2 C.4 D.8
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