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【单选题】
非竞争性抑制剂 存在时,酶促反应的动力学特点是A.
K m 值不变，Vmax降低
B.
K m 值不变，Vmax增加
C.
K m 值增高，Vmax不变
D.
K m 降低，Vmax不变
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举一反三
【单选题】Western nations have older and shrinking populations since they entered the 21st century and their ( ) birth rates have also posed problems.
A.
prejudiced
B.
respective
C.
fluctuating
D.
enlightening
【单选题】Western nations have older and shrinking populations since they entered the 21st century and their _____ birth rates have also posed problems.
A.
fluctuating
B.
flourishing
C.
enlightening
D.
motivating
【单选题】Western nations have older and shrinking populations since they entered the 21st century and their ______ birth rates have also posed problems.
A.
fluctuating
B.
enlightening
C.
investigating
D.
preserving
【单选题】Western nations have older and shrinking populations since they entered 21 st century and their _____ birth rates have also posed problems.
A.
high
B.
lowering
C.
fluctuating
D.
improving
【单选题】Western nations have older and shrinking populations since they entered the 21st century and their _______ birth rates have also posed problems.
A.
revolving
B.
investigating
C.
restoring
D.
fluctuating
【单选题】Western nations have older and shrinking populations since they entered the 21st century and their ______ birth rates have also posed problems.
A.
fluctuating
B.
enlightening
C.
investigating
D.
implementing
【单选题】. -- What does the sign on the wall read? --“ No person ______ enter it without permission.”
A.
will
B.
may
C.
shall
D.
must
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