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简述菌种的退化原因。

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Over the weekend, a shoe store sold 1/3 of the shoes in its stock. The average price of the shoes sold was $60 per pair. What was the total revenue from shoe sales over the weekend for this shoe store？
(1) When the store closed on Sunday night, 600 pairs of shoes were still in stock.
(2) The store began the weekend with 900 pairs of shoes.

概述异化与网络文化主体异化的概念。简述构建网络主流文化的主要途径。

生产者对生产资料的需求，常常取决于消费品市场对这些生产资料制品的需求，因此，有人称之为“引申需求”。()

企业应以是否能卖出产品作为市场营销活动的核心。()