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【单选题】
已知某酶的Km为0．05mmol／L，试问要使此酶所催化的反应速度达最大反应速度的80％时，底物浓度应是A.
0．1mmol／L
B.
0．2 mmol／L
C.
0．4mmol／L
D.
0．5mmol／L
E.
0．6 mmol／L
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A.
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B.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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