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【多选题】
下列属于氨基酸类药物常用的分离方法有A.
溶解度和等电点法
B.
特殊沉淀法
C.
离子交换法
D.
氨基酸的结晶与干燥
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【单选题】—hat do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.
A.
that, for
B.
it, for
C.
it, of
D.
that, of
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【简答题】Another cultural aspect of nonverbal communication is one that you might not think about: space. Every person perceives himself to have a sort of invisible shield surrounding his physical body. When s...
【单选题】Coach feels like he and Nick are "family" because ______.
A.
they have become very close over the past four years
B.
he is related to Nick
C.
Nick does not have another family
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