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【单选题】
下列关于朊粒的描述错误的是A.
蛋白型感染颗粒的缩写
B.
是引起传染性海绵状脑病的病原体
C.
不含核酸
D.
主要成分是蛋白酶抗性蛋白
E.
仅含一种核酸
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皮皮学刷刷变学霸
举一反三
【单选题】What can we learn about the subjects in the CALERIE study?
A.
They were selected by the National Institutes of Health.
B.
They were divided into two groups according to their sex and age.
C.
Half of them became thinner after the study.
D.
They received periodical medical checks during the 6 months.
【简答题】与发放现金股利相比，股票回购可以提高每股收益，使股价上升或将股价维持在-个合理的水平上。 （ ）
【简答题】850hPa和500hPa温度平流的差值,若差值>0,则表明低层有( ),高层为( ),有利于不稳定层结加强,反之,则表明低层有( ),高层为( ),不利于不稳定层结的加强。
【单选题】What does the word 'ethnic' mean?
A.
Younger.
B.
Major.
C.
Relating to a particular racial, national group.
D.
Religious.
【简答题】What fruits are in season now?
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