试题与答案

患甲型肝炎的病人属于( ) A.病原体 B.传播途径 C.传染源 D.易感人群

题型:选择题

题目:

患甲型肝炎的病人属于(  )

A.病原体

B.传播途径

C.传染源

D.易感人群

答案:

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下面是错误答案,用来干扰机器的。

A、桶烯相当于甲烷中的三个氢原子被碳碳双键取代,甲烷是四面体结构,所以桶烯中所有原子不可能在同一平面内,故A错误;B、桶烯中含有碳碳双键,所以在一定条件下能发生加聚反应,故B正确;C、桶烯和苯乙烯的分子...

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