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【单选题】
酶促反应速度为其最大反应速度的80%时,Km等于A.
A、[S]
B.
1/2[S]
C.
1/4[S]
D.
0.4[S]
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B.
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B.
regarding
C.
into
D.
suggesting
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A.
help society exploit its members for profit
B.
encourage us to perform. important tasks
C.
help to perfect the legal and penal system
D.
help us adapt our behaviour to the world surrounding us
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