请高人帮我翻译几个标题

1.the Responsibility-Cost Management and the Enterprise's Economic Profits
2.Study on the Cost-control in Product-design Phase
3.About the Management in the Responsibility Cost

1. The responsibility of the cost of management and economic efficiency of enterprises

2. Product design phase of the study cost control

3, of responsibility for cost management

1.The management of responsibility cost and the economic benefit of enterprises.
2.The research to the cost control in product-designing stage.
3. A brief introduction to the management of responsibility cost.
非机译.