单项选择题

酶的Km的大小与（）

A.酶作用温度有关
B.酶浓度有关
C.酶的性质有关
D.酶作用时间有关
E.底物浓度有关

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数控铣床的主轴转速和进给速度都是无级变速的，因此有利于选择最佳切削用量，提高生产效率

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For the following argumentative topics of A “Considering its geological position, Turkey has an important geopolitical role in the EU” and B “Considering its geopolitical role, we can clearly say that the EU cannot be without Turkey”, A is better, for facts can be an argument.

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