试题与答案

医院感染例次发生率() A.是指在一定时间和一定人群(通常为住院患者)中新发生的医院

题型:单项选择题 B型题

题目:

医院感染例次发生率()

A.是指在一定时间和一定人群(通常为住院患者)中新发生的医院感染的频率。

B.是指短时间内处于危险人群中新发生医院感染的频率

C.是指在一定时间或时期内特定部位感染危险人群中新发生该部位医院感染的频率

D.是指在一定的时间或时期内,在一定的危险人群(住院病例)中实际感染(新、老医院感染)例数所占的百分比

E.是指在某医疗机构或其科室的患者中短时间内突然发生多起感染病例的现象

答案:

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(1) (2)6m (3)18J题目分析:(1)由图乙知前2s木板做匀加速运动,B受向右的摩擦力,做加速运动,a1= 1m/s2,3s末速度等于3 m/s2,等于木板的速度,由于木板做减速运动的加速度大于B的,故3s后木板...

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研究表明,很少服用抗生素即抗菌药的人比经常服用抗生素的人有更强的免疫系统。然而并无证据表明服用抗生素会削弱免疫系统。 以下哪项,如果正确,能最好地调和以上信息中明显的分歧

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