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建立模型的目的是为了合理地描述相关的物理机制。()

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暗物质主要成分是中微子。()

企业进行行业比较和选择的价值标准是(),也称为()。

常见的传递过程有质量传递，动量传递和热量传递。()

听力原文：Customers are much less loyal these days, so companies have to work hard to get repeat sales. And that means having staff who really understand customer care, and identifying what will sell. But of course demand changes. My first job was with an electronics firm that just didn't keep up with technical developments. They assumed there would always be a demand for their goods, and let their competitors get ahead of them. As a result they went out of business.
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