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最早用人痘苗预防天花的国家是( )
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最早用人痘苗预防天花的国家是( )
A、中国
B、日本
C、美国
D、俄国
E、英国
时间:2021-09-01 23:50
关键词:
青书学堂
齐齐哈尔医学院
免疫学
答案解析
A
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