单项选择题

河南某流域执行四类水标准，那么，该水体不能用来
A、工业用水区‍
B、人体非直接接触的娱乐用水区
C、农业用水区‍
D、生活饮用水源地
E、一般景观要求水域

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单项选择题

According to the theory of the firm, which of the following statements describes an oligopoly?

A．There are many producers but they each use product differentiation to distinguish themselves from each other
B．There are four producers exerting considerable influence in the market
C．There are no barriers to entry into or exit from the market
D．There is only one producer in the market

货车在编组站作业停留的时间占30%以上。
正确
错误

答案：正确