消防队员以及紧急救援人员调查联合航空93号航班致命坠机的现场。

Firefighters and emergency personnel investigate the scene of the fatalcrash of United Airlines Flight 93, on Tuesday morning, September 11, 2001 near Shanksville, Pennsylvania.(AP

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这课涵盖航空和陆军来源的课题背景，并要查看由反应者和现场指挥者的急救医疗服务技术。

This subject covers the aviation and military origin background of the topic and looks at the ems application by responders and site commanders.

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这课涵盖航空和陆军来源的课题背景，并要查看由反应者和现场指挥者的急救医疗服务技术。

This subject covers the aviation and military origin background of the topic and looks at the ems application by responders and site commanders.

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