为此，研究了运输产品市场选择的用户效用极大化原理，建立了运输产品服务水平量化标定的效用函数；
The paper introduced the utility function that can calibrate the service level of transportation products on the basis of the maximum principle for user utility in selecting transportation products.
为此，研究了运输产品市场选择的用户效用极大化原理，建立了运输产品服务水平量化标定的效用函数；
The paper introduced the utility function that can calibrate the service level of transportation products on the basis of the maximum principle for user utility in selecting transportation products.
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