Highly effective in terms of initial cost and general usability, the steel sub-frame floor systems creates a level and solid platform on which to base your event.
在初始成本高和一般可用性方面有效，钢子框架层系统创建了一个坚实的平台水平和所依据您的活动。
2
Many developers have high hopes that the PDE will ultimately become the most cost-effective method of propelling supersonic sub-orbital craft.
许多开发人员具有很高的希望，PDE将最终成为最具成本效益的推动超音速亚轨道飞行器的有效方法。
3
Sub-models are effective labor model, fixed capital model, productive cost model and land productivity model.