题目内容

已知A是一个三阶实对称且正定的矩阵,那么A的特征值可能是()

A. 3,i,-1
B. 2,-1,3
C. 2,i,4
D. 1,3,4

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标准预防的基本特点为：①既要防止血源性疾病的传播，也要防止非血源性疾病的传播；②强调双向防护，既防止疾病从病人传至医务人员，又要防止疾病从医务人员传至病人；③根据疾病的主要传播途径采取相应的隔离措施，包括接触隔离、空气隔离和微粒隔离。