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【单选题】
核酸分离纯化的 总技术路线不包括A.
核酸的释放、分离、纯化
B.
核酸的存在形式
C.
核酸的浓缩、沉淀与洗涤
D.
核酸的鉴定与保存
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反馈参考答案：
举一反三
【单选题】下列四种放射性同位素中，可用来透照厚度为3-12mm的薄壁管，辐射特性类似100-250KVX射线的是（）
A.
Ir192
B.
Cs137
C.
Co60
D.
Tm17
【单选题】A lot of language learning ,_______has been discovered, is happening in the first year of life, so parents should talk much to their children during that period .
A.
as
B.
it
C.
which
D.
this
【单选题】A lot of language learning，________ has been discovered，is happening in the first year of life，so parents should talk much to their children during that period.(2012·安徽，29)
A.
as
B.
it
C.
which
D.
this
参考解析：
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