试题与答案

影响传染病流行过程的因素是()。 A.自然因素 B.社会因素 C.自然因素和社会因素

题型:单项选择题

题目:

影响传染病流行过程的因素是()。

A.自然因素

B.社会因素

C.自然因素和社会因素

D.病原体的毒力

E.病原体的侵袭力

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:电压源US2单独作用时,把电压源US1短路和电流源IS开路,得电压源两端电压分量。

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