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【单选题】
酶提取制备过程中错误的操作是A.
超声波提取
B.
有机溶剂沉淀
C.
离子交换层析
D.
保持低温操作
E.
抽提过程加巯基乙醇
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皮皮学刷刷变学霸
举一反三
【单选题】The village seemed _____, the only sign of life _____ some trees waving in the howling wind. [ ]
A.
alone; were
B.
deserted; being
C.
lonely; was
D.
abandoned; to be
【简答题】阅读理解. Howling(吼叫) is a behavior commonly observed among a wolf pack(狼群). As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. Ther...
【单选题】Having heard wolves howling in the forest, Lala her walk up the path to the caves fearing that there might be wild beasts lying in wait for her．
A.
accumulated
B.
circulated
C.
accelerated
D.
calculated
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