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【单选题】
某鸡场300只34日龄鸡发病,发病率90%,病死率为80%。病鸡伸颈张口呼吸,咳嗽,气喘,有鼻漏;部分鸡翅、腿麻痹,下痢,粪带血;剖检见嗉囊积液,全身性黏膜和浆膜出血,盲肠扁桃体肿胀、出血。该病的病原可能是(2009真题下185)
A.
新城疫病毒
B.
柔嫩艾美耳球虫
C.
传染性法氏囊病病毒
D.
传染性支气管炎病毒
E.
传染性喉气管炎病毒
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【单选题】吸入粉雾剂中药物的药物粒度大小应控制在10μm以下，其中大多数应在（ ）以下
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【单选题】流动资产与固定资产等资产比较,具有的特点不包括( )。
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查看完整题目与答案
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D.
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查看完整题目与答案
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unbiased.
B.
minimum variance.
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biased.
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