有时间请进来看一下
Bit   -   A   data   unit   which   must   be   in   one   of   the   two   binary   states   described   above.   It   is   the   smallest   data   unit   that   exists.  
Byte   -   8   bits   of   data   which   has   a   possible   value   from   0   to   255.  
Word   -   Two   bytes   or   16   bits   of   data   with   a   possible   unsigned   value   from   0   to   16535.

这个16535我不太明白？

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应该是65535吧 2的16次方减1
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对，应该是2的 16次方减1
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帮顶，接分~~
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