以下关于采用一位奇校验方法的叙述中，正确的是（ ）。
- A.若所有奇数位出错，则可以检测出该错误但无法纠正错误
- B.若所有偶数位出错，则可以检测出该错误并加以纠正
- C.若有奇数个数据位出错，则可以检测出该错误但无法纠正错误
- D.若有偶数个数据位出错，则可以检测出该错误并加以纠正
正确答案及解析
正确答案
解析
对于奇偶校验，是由若干位有效信息，再加上一个二进制位（校验位）组成校验码，其中奇校验“1”的个数为奇数，而偶校验“1”的个数为偶数，以此校验，如果其中传输过程中有偶数个数发生错误（即1变成0或0变成1），则“1”的个数其奇偶就不会发生改变，也就无法发现错误了，只有奇数个数据位发生错误，才能发现错误。同时，奇偶校验只能查错不能纠错。因此本题选择C选项。
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