Therefore, in the short run, typically labor and materials costs are variable costs, while capital costs are fixed.

所以，在短期运行生产中，典型的生产力和原料的成本是可变成本，资本成本是固定成本。

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Project management costs adopt the mode of comprehensive unit price of fixed labor days and provisional total price offer in the light of working range.

工程项目管理费根据工作范围采用固定人工日综合单价、暂定总价报价方式。

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Historically, the margins have risen over the years since the sales growth has outpaced the rate at which the fixed costs (such as labor and occupancy costs) have increased.

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