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434有机溶剂之所以能使酶沉淀析出。主要是由于有机溶剂的存在会使溶液的介电常数升高。
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435离心分离、过滤与膜分离、沉淀分离、层析分离等都不能用于酶的浓缩。
Which section in balance sheets do net capital expenditures of a company represent?
The capital investment project, that is called (), is designed toenhance revenues by focusing operations to expand into completely new products or markets.
According to the degree of their dependence on other projects, investment projects can be classified into ().
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