交易费用所拥有的第二项变量是市场规模，这决定了所发生的是人格化交换还是非人格化交换。

The second variable in the costliness of the exchange posses is the size of the market, which determines whether personal or impersonal exchange occurs.

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本文假设在复合二项模型中保险公司的保费收入流为一个随机变量序列，将模型进行推广。

Supposed the income flow of the insurance company is a serial of random variables in the compound binomial model, we generalized the compound binomial model.

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介绍了用离散型随机变量的二项分布函数从试题库随机选题的数学模型。

This paper introduces the mathematical model for dynamically choosing questions from the question database by using binary distributed function with random variables.

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