单项选择题

For activated carbon, the process of adsorption can be divided into four steps: solution transport, film diffusion, pore diffusion, and adsorption. In water treatment, film diffusion transport or pore transport is usually the rate limiting step. ( )

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现金流量表通常表现为一定时期的经营活动现金流量的增减情况。

答案：错误

单项选择题

金融债券的发行主体是银行或非银行金融机构。金融机构一般有雄厚的资金实力，信用度较高，通常被称为“金边债券”。（）