选择题:治疗梅毒首选抗生素为(  )。

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题目内容:

治疗梅毒首选抗生素为(  )。

A.青霉素类

B.四环素类

C.红霉素类

D.喹诺酮类

E.氨基糖甙类

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答案解析:

某工业城市,某年夏天的几天时间里,光照强烈,空气出现了浅蓝色的烟雾,具有较强的刺激性。该市的交通流量并不大。该烟雾的主要来源可能是(  )。

某工业城市,某年夏天的几天时间里,光照强烈,空气出现了浅蓝色的烟雾,具有较强的刺激性。该市的交通流量并不大。该烟雾的主要来源可能是(  )。

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