男，65岁。发热，咳嗽4天，查体：T39℃，口唇发绀，双下肺可闻及湿啰音，既往体健，否认肺部疾病病史，SPO285%，肺部X线片示双下肺感染，可作为经验性抗感染治疗首选的药物是 （1）正确选项（A）：患者发热，咳嗽，X线片示双下肺感染，考虑诊断为肺炎。社区常见的致病菌有：肺炎链球菌，铜绿假单胞菌。故经验性抗感染首选青霉素或第三代头孢菌素 （2）错误选项（B）：医院获得性肺炎常用二、三代头孢菌素、β ...

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