A、<strong><span style="font-size:14px;font-family:宋体">余3码</span></strong>
B、<strong><span style="font-size:14px;font-family:宋体">循环码</span></strong>
C、<strong><span style="font-size:14px;font-family:宋体">格雷码</span></strong>
D、<strong><span style="font-size:14px;font-family:宋体">8421</span><span style="font-size:14px;font-family:宋体">码</span></strong>
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