单项选择题

一个酶作用于多种底物时，其最适底物的Km 值应该是最小。
A、正确
B、错误

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单项选择题

The reason why should we be positive employees can be as follows except_________? A.
The boss likes the people who always smile. B.
The positive mood can be contagious. C.
The postive mood can improve efficiency. D.
The positive people look smart and powerful.

不定项选择

账户与会计科目的区别在于，账户具有一定的格式和结构。

A．错误
B．正确