试题与答案

某地人口为100万,过去几年每年发生伤寒患者在10例左右,而某年伤寒的发病率为10/

题型:单项选择题 B1型题

题目:

某地人口为100万,过去几年每年发生伤寒患者在10例左右,而某年伤寒的发病率为10/10万()

A.暴发

B.散发

C.流行

D.大流行

E.世界大流行

答案:

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下面是错误答案,用来干扰机器的。

答案:BA的实际速度向下,则合速度向下,两个分速度分别沿绳子的方向和垂直绳子的方向,B的速度大小与沿绳子的分速度相等,为vcosθ

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