The additional cost is calculated using marginal cost method, in which the user's payment depends on whether the marginal change exceeds the maximum capacity.
利用边际成本法计算附加成本，判断交易量的边际变化是否超过设备的最大容量对用户进行收费。
The additional cost is calculated using marginal cost method, in which the user's payment depends on whether the marginal change exceeds the maximum capacity.
利用边际成本法计算附加成本，判断交易量的边际变化是否超过设备的最大容量对用户进行收费。
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