问答题

汤非凡在工作中都做出了哪些贡献？

答案：研制生产青霉素。研制牛痘苗,治愈盟军的天花病。研制中国最早斑疹伤寒疫苗,控制了盟军中的“不明热”。生产牛痘苗、卡介...

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单项选择题

Plns hve been proposed _ the lrgest dm in the world to be builtlong the Congo river．ofB．wiPlns hve been proposed _ the lrgest dm in the world to be builtlong the Congo river．of B．with C．for D．on

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