OBJECTIVE to study the distribution and drug resistance of nosocomial infection pathogens from lower respiratory tract in senile patients and give draft preventive and control measures.

目的探讨老年患者下呼吸道感染常见病原菌的分布及耐药状况，制定针对性预防与控制措施。

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The preventive maintenance sections are divided by using dynamic cluster method and three indexes including rutting depth, transverse crack length and skidding resistance.

采用车辙深度、横向裂缝长度和路面抗滑性能指数三指标，使用动态聚类法，划分预防性养护路段。

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OBJECTIVE to investigate the bacterial spectrum of nosocomial pneumonia (NP) and characteristics of drug resistance in ICU and to evaluate the clinical preventive and therapeutic countermeasures.

目的调查重症监护病房(icu)医院内肺炎(np)菌群的分布及耐药特点，探讨其临床防治对策。

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