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(题干)某4鸡群发病，2天内波及，死亡率迅速上升，病鸡羽毛松乱，扎堆，排出白色鸡粪，严重脱水，病死鸡胸肌和腿肌有条纹状或斑点状出血，肾脏有尿酸盐沉积。该病最可能是( )A.禽流感 B.新城疫 C.传染性法式馕病 D.鸡传染性支气管炎 E.鸡传染性喉气管炎 快速检测病原的实验室常用方法是( )A.免疫组化发 B.琼脂扩散实验 C.病毒分离鉴定 D.病毒中和实验 E.易感鸡接种实验 预防该病最有效的措施是( )A.净化种鸡群 B.注射卵黄抗体 C.疫苗免疫接种 D.提高饲料维生素含量 E.调整饲料蛋白质含量
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举一反三
【单选题】Accidents may occur when people feed cookies and candy to bears because______.
A.
the latter is not only greedy but also unfreindly
B.
the latter may mistake a feeding hand for the offered cookie
C.
the latter is the most ferocious carnivore and they attack humans on sight
D.
.
【单选题】Which of the following statements is NOT TRUE about “The Glass Mountain”?
A.
It refuses to follow the story line of an existing fairy tale.
B.
It shows no trace of anything heroic or romantic.
C.
The author presents a picture of an absurd man doing absurd things .
D.
The story concludes with a happy ending.
【简答题】Cultural notes Ren shan ren hai, which can be literally translated to “people mountain people sea,” means “huge crowd of people”. The idiom people mountain people sea, an example of Chinglish, is wide...
【单选题】Everyone wants to be healthy and happy.【C1】______, ill ness or accidents may occur without any【C2】______. Frequently the person who is【C3】______can be cared for at home if there is someone【C4】______of...
A.
Occasionally
B.
Unfortunately
C.
Miserably
D.
Naturally
【简答题】一个TCP连接的建立,需要由____次“握手”来完成。构成TCP连接的一对套接字,由IP和____组成。
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