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【单选题】
夏季,5 周龄散养鸡群食欲不振,腹泻,粪便带血,剖检见小肠中段肠管高度肿胀,肠腔内 有大量血凝块,刮取肠粘膜镜检见多量裂殖体。预防该病的药物是A.
菌素
B.
盐霉素
C.
菌素
D.
咪唑
E.
链霉素
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皮皮学刷刷变学霸
举一反三
【简答题】An organism’s life history is its lifetime pattern of ( ) and reproduction
【简答题】A multicellular organism has ______ cell(s).
【简答题】A multicelluar organism has ___ cell(s).
【多选题】副语言,指除有声语言以外,人体的面部表情、动作,以及附属于人体的服装、发型、饰物、化妆等。它包括()和()两部分。
A.
表情语
B.
体态语
C.
形象造型
D.
身体仪态
【单选题】An organism is capable of oxidizing H2S and using the energy obtained from the reaction to reduce carbon dioxide. Which type of metabolism does this organism possess?
A.
Photolithotrophic autotroph
B.
Chemoorganotrophic heterotroph
C.
Photoorganotrophic heterotroph
D.
Chemolithotrophic autotroph
E.
Not enough information to determine which type
【单选题】A new type of organism discovered in an Arctic tunnel came to life in the lab after being frozen for 32,000 years. The deep-freeze bacteria could point to new methods of cryogenics, and they are the s...
A.
We might one day find form. of life on other planets.
B.
Scientists from NASA made a great progress in discovering the microorganisms
C.
To retrieve any life that has died long ago is impossible.
D.
Alaska is a place abundant in microorganisms.
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