... precipitator 聚尘器 precise levelling 精密水准测量 pre-clearance occupation survey 清拆前进行的居民登记 ...
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invar precise levelling staff 殷钢精密水准尺
precise levelling rod 精密水准尺
precise levelling survey 精密水准测量
A method of precise levelling under unequal back-and fore-sight length is studied and presented in this paper.
本文研究提出了在前后视距不相等的情况下进行精密水准测量的方法，分析了具体的实测方案。
Very easy installation with the KaVo levelling aid: precise and fast orientation reduces the installation costs.
利用卡瓦校平辅助装置非常容易进行安装：精确和快速定位降低了安装成本。
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