【判断题】传染病的流行过程是传染病在人群中发生、蔓延及终止的过程,它的发生必须具备传染源、传播途径和疾病爆发三个基本环节。( )
【判断题】____传染病流行具备传染源、传播途径及易感的动物三个条件,这三个条件同时存并相互联系时就会造成传染病的发生。P42
【判断题】传染病流行过程必须具备三个基本环节,即传染源、传播途径及传染病人。
【判断题】____传染病流行具备传染源、传播途径及易感的动物三个条件,这三个条件只要存在一个即可造成传染病的发生。P42
【单选题】The review for the specification completeness is performed during which of the following cycles.
【单选题】● (66) from one phase are usually reviewed for completeness and accuracyand approved before work starts on the next phase.
【单选题】传染病的流行过程,必须具备传染源、传播途径及()三个环节。