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【单选题】
决定MHC分子多态性的因素是A.
MHC基因连锁不平衡
B.
MHC分子可以分裂
C.
MHC分子有相关性
D.
MHC分子间有交叉反应
E.
MHC基因是复等位基因，均为共显性
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A.
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B.
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C.
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