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【单选题】
一个简单的酶促反应，当[S]〈Km时（）。A.
反应速度最大
B.
反应速度难以测定
C.
底物浓度与反应速度成正比
D.
增加酶浓度，反应速度显著变大
E.
[S]增加，Km值也随之变大
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