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【单选题】
已有定义int a=3；和输出语句printf('%8x'，A)；以下正确的叙述是( )。A.
整型变量的输出格式符只有%d一种
B.
%x是格式符的一种，它可以适用于任何一种类犁的数据
C.
%x是格式符的一种，其变量的值按十六进制数输出，但%08x是错误的
D.
%8x是正确的格式符，其中数字8规定了输出字段的宽度
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