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【多选题】
下列属于病毒基因组结构特点的有A.
基因组多数是多倍体
B.
编码区在基因组中的比例极少
C.
含有大量基因重叠现象
D.
病毒核酸类型可能是DNA，也可能是RNA
E.
转录产物为多顺反子
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