题目内容：
20GB的硬盘表示容量约为（ ）。
A．20亿个字节 B．20亿个二进制位
C．200亿个字节
D．200亿个二进制位
参考答案：
答案解析：
单选题：20GB的硬盘表示容量约为（ ）。
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B．20亿个二进制位
C．200亿个字节
D．200亿个二进制位
B．20亿个二进制位
C．200亿个字节
D．200亿个二进制位
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