- Average variable cost平均可变成本，平均变动成本;
- Average fixed cost平均不变成本;
- Average cost平均成本;
- attainable cost可达到的成本;
- atomic unit原子单位;
- at the cost of以…为代价;
- at the cost付出代价
- at any costadv.无论如何;不惜代价;
- Alternative cost替代成本;
- airless spray unit真空喷涂装置;
- air to air heat recovery unit空气 空气热交换式热回收组合机组;
- air handling unit空气调节装置;
- air conditioning unit空调设备，空气调节设备;
- after cost后续成本;
- acquisition costn.置业费，购置成本;
- business unit营业单位;
- burn unit烧伤病房;
- british thermal unitn.英热单位（一种热量单位）;
- book cost账面成本;
- boiler unit锅炉机组，锅炉组;
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