【单选题】【消耗次数：1】
苗木猝倒病的生物学病原为（）。
①
真菌
②
细菌
③
病毒
④
线虫
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相关题目
【单选题】
根据目前掌握的新型冠状病毒生物学特点、流行病学特征、致病性、临床表现等信息，该病原体暂按照病原微生物危害程度分类中第（）类病原微生物进行管理
①
一
②
二
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三
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四
【单选题】
根据目前掌握的新型冠状病毒生物学特点、流行病学特征、致病性、临床表现等信息，该病原体暂按照病原微生物危害程度分类中（ ）类病原微生物进行管理？
①
第一
②
第二
③
第三
④
第四
【单选题】
关于冠状病毒的生物学特性描述不正确的是（）
①
呈球形或椭圆形，具有多形性
②
RNA病毒中基因组最大
③
无包膜
④
螺旋状核衣壳，直径9~11 nm
⑤
(+)ssRNA ，线性非分节段
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