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【单选题】
梯度萃取法分离黄酮苷元类化合物时加碱液萃取的顺序是A.
NaHCO3——NaoH——Na2C03
B.
NaoH——Na2C03——NaHCO3
C.
NaoH——NaHCO3——Na2C03
D.
Na2C03——NaHCO3——NaoH
E.
NaHCO3——Na2C03——NaoH
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举一反三
【单选题】No man can choose his parents. ( )
A.
get the better of
B.
select
C.
to date E. essential
D.
extensive
E.
essential
【简答题】A. get the better of B. select C. to date D. extensive E. essential 4. No man can choose his parents. ( ) (2.0分)A. B
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A.
with
B.
about
C.
for
D.
to
【单选题】Choose the word or phrase that can replace the underlined part in each sentence without changing its original meaning. She gradually perceived perceived that her parents had been right.
A.
noticed
B.
knew
C.
accepted
D.
realized
【单选题】No man can choose his parents. ( )
A.
get the better of
B.
select
C.
to date
D.
extensive
E.
essential
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