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【简答题】
酶反应动力学研究表明,在底物浓度足够高的条件下,酶催化反应速度与酶浓度成( ),提高酶浓度可以( )催化反应的速度,然而酶浓度的提高必然会增加用酶的费用,所以酶浓度不是( )越好,特别是对于价格高的酶必须综合考虑反应速度和成本的问题,确定一个适宜的( )。
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皮皮学刷刷变学霸
举一反三
【单选题】立克次体与细菌的主要区别是（）
A.
立克次体有细胞壁和核糖体
B.
立克次体含有DNA和RNA两种核酸
C.
立克次体以二分裂方式繁殖
D.
立克次体能人工培养
E.
立克次体是严格的细胞内寄生
【单选题】He studied hard at school when he was young, __________ contributed a lot to his success.
A.
which
B.
therefore
C.
that
D.
what
【简答题】He was made ______ hard. A) to study B) study C) studying D) studied
【简答题】语言的谱系分类和语言结构类型的分类各自依据的标准是什么同系属的语言在结构上是不是一定相同为什么？
【单选题】Michael studied hard before the examination in mathematics, and it ______ . He made an A.
A.
paid out
B.
paid off
C.
paid over
D.
paid well
【单选题】He studied hard at school when he was young, ______ contributes to his success in later life.
A.
which
B.
that
C.
what
D.
each of which
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