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64GB是手机的存储空间，4GB是手机的运行内存。
64GB/4GB代表主流安卓的存储水平。
1G等于1024MB，64G等于65536MB。
存储空间，指数据存储所需要的介质。
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物理地址的集合称为物理空间，也称存储空间，即某个存储设备的总容量，如256MB的 内存、128MB的U盘、80GB的硬盘等。
每一个字符的编码由2个字节构成，其值分别为其区位码值各加上32，方便起见把这称作国标码，则国标码所覆盖的范围为2121H－777EH。
当想在由西方人发明的计算机中使用汉字时，由于国标码的范围与计算机中使用的 ASCII 码重叠，无法分出哪个是中文哪个是西文，于是规定将国标码的高低字节的最高位均置1，来使之区分于 ASCII 码。
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这样，在计算机中使用的汉字编码实际上是真正的国标码的高位置1后的变形码（以后称此码为 GB 码），编码范围是0A1A1H－0F7FEH，前面的“中”字的 GB 码就是0D6D0H。
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