试题与答案

流行性出血热是由流行性出血热病毒引起的以发热、出血和肾脏损害为主要临床表现的烈性传染

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题型：单项选择题

题目：

流行性出血热是由流行性出血热病毒引起的以发热、出血和肾脏损害为主要临床表现的烈性传染病，常见于人类，属自然疫源性疾病，宿主以啮齿类动物为主。大鼠多表现为（），感染鼠可以长期向外排毒，从而危及人类健康。

A.明显的临床症状

B.显性感染

C.不感染

D.隐性感染

答案：

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参考答案：切向振动即绕叶片截面最小惯性主轴弯曲振动，其振动方向接近叶轮圆周切线方向。

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