基准的

The Al-based amorphous alloy forms in the peritectic reaction and peritectoid reaction, and its growth velocity is slow.

分析铝晶合金组织与相变特征，铝晶通常为包晶、包析反应，其长大速度较慢。

This dissertation presents the theory and method on the establishment of height datums.And some problems on the geocenter motion are also studied.

本文系统地研究建立高程理论与方法、地心运动规律及其对高程影响等有关问题。