datum line

基本解釋

A line of punch positions parallel to the Y datum line of a punch card.
基準線平行，在地平面或者基準平面上。
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.
介紹振動參量轉換的意義和加速度積分為速度和位移時基線修正的必要性和兩種具體方法：最小均方速度法和零終值條件法。
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.
對以張力金屬絲作為激光測長系統(tǒng)虛擬導軌導航基準的可行性進行了分析，給出了系統(tǒng)的工作原理。

基準線
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.
確定了以基準線項目為參照,通過清潔發(fā)展機制項目與基準線項目進行比較來衡量清潔發(fā)展機制項目可持續(xù)能力的評價方法。
經(jīng)濟學
基準線