皮皮学，免费搜题
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搜题
【单选题】
甲型流感病毒抗原小幅度变异称为
A.
溶原性转换
B.
抗原性转换
C.
抗原性漂移
D.
HO变异.
E.
WV变异
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【简答题】We spent a day in the country and picked a lot of flowers. Our car was of flowers inside! the way home we had to stop at traffic lights, and there my wife saw the bookshelf. It stood outside a furnitu...
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