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本文引进“视准线”的新概念以补充“机准轴”概念的不足。
This paper introduces a new conception of collimation line to make up for the inadequacy of the notion of collimation axis.
小浪底大坝是枢纽安全监测的重要部位，埋设了大量内部观测仪器，布设了8条视准线。
The dam is important for the safety monitoring of Xiaolangdi Multipurpose dam Project because a lot of instruments and 8 collimating lines have been built inside the dam.
但在大坝视准线法不等精度观测中，由该基本定权公式推导的实用定权公式与测量平差书上的实用定权公式不一致。
But the practical formula for deciding weight derived from this basic formula is different from tha written in the books of survey adjustment.
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