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【多选题】
关于酶促反应的叙述不正确的是 ()。A.
底物浓度低时，反应速度与底物浓度不成正比。
B.
反应开始时，底物浓度增加与反应速度成正比。
C.
底物浓度与酶浓度相等时，反应达最大速度。
D.
反应速度为最大反应速度一半时，底物浓度等于常数。
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