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【单选题】
某酶今有4种底物(S),其Km值如下,该酶的最适底物为A.
S1:Km=5×10-6M
B.
S2:Km=1×10-5M
C.
S3:Km=10×10-5M
D.
S4:Km=2×10-5M
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