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对天花有预防作用的是
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对天花有预防作用的是
A.人痘苗
B.牛痘苗
C.抗毒素
D.类毒素
E.卡介苗
正确答案:人痘苗;牛痘苗
Tag:
医学免疫学
牛痘苗
痘苗
时间:2023-12-26 21:04:16
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