datum line

基本解释

A line of punch positions parallel to the Y datum line of a punch card.
基准线平行，在地平面或者基准平面上。
The significance of transforming the vibration-Parameter, the necessity on the correction of datum line when Integrating acceleration into velocity and displacement have been described.
介绍振动参量转换的意义和加速度积分为速度和位移时基线修正的必要性和两种具体方法：最小均方速度法和零终值条件法。
The feasibility of taking strained-wire as navigating datum line of dummy guide-way was analyzed in laser length measurement system, and working principle of the system was presented.
对以张力金属丝作为激光测长系统虚拟导轨导航基准的可行性进行了分析，给出了系统的工作原理。

基准线
It also establishes the evaluation method for measuring the sustainable development capacity of CDM projects by taking the datum line as a reference and by comparing CDM projects with the datum line projects.
确定了以基准线项目为参照,通过清洁发展机制项目与基准线项目进行比较来衡量清洁发展机制项目可持续能力的评价方法。
经济学
基准线