题目内容：
线性分组码（63，51）的编码效率为（），卷积码（2，1，7）的编码效率为（）。
参考答案：
填空题：线性分组码（63，51）的编码效率为（），卷积码（2，1，7）的编码效率为（）。
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- 题目类型：填空题
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