题目内容
卡介苗(BCG)来源于
2021-12-16
A.结核菌发生毒力变异
B.结核菌体内的酶活性发生变异
C.结核菌的菌体结构发生变异
D.结核菌的抗原性发生变异
E.结核菌对药物的敏感性发生变异
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