题目内容
经空气传播的传染病其流行特征不包括
2021-10-09
A.传播广泛，途径易于实现，发病率高
B.夏秋季节高发
C.少年儿童多见
D.在未免疫预防人群周期性升高
E.受居住条件和人口密度的影响
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