基础模板支设不牢固，浇筑混凝土下料过高、混凝土振捣撞击，使模板位移，造成基准线产生偏差。
The foundation template support is not strong, the pouring concrete is too high, the concrete vibration impact, so that the template displacement, resulting in the deviation of the baseline.
其次，分析了弹簧吊装系统的跌落冲击响应特性，得到产品的最大位移、最大加速度、冲击持续时间分别与基准系统相应值的比值；
Secondly, shock response property is analyzed, the ratios of item' s most displacement, most acceleration and shock duration to benchmark system are obtained.
对没有固定基准的自由网，位移矢量是真实位移的有偏估值，有时精度最高的地方发现变形能力并非最强。
The displacement vector is biased estimated values, and sometimes, the area where the measuring accuracy is the highest could not have the best ability to detect the deformation.
本文介绍了在设计时，为设立完整而合理的垂直位移测控系统，对基准点、工作基点、标志和测控网布设的考虑。
This paper presents the consideration of establishing the bench marks, working bench marks, marks nets properly for the survey control net of vertical displacement in observation design.
通过对信号波形的逐步处理可以获得波形转折点的位置，以此为基准点可以实现位移的精测。
We find that they can be properply identified by gradually processing the waveforms and the precision measurement of displacement can be implemented based on them.
提出一种新型激光准直仪理论根据，证明在一定范围内激光束平移或角位移并不影响基准线的位置。
A new theoretical basis of novel laser alignment instrument is put forward. It proves that the position of the basic line will not be influenced when the laser beam has translation and angular motion.
提出一种新型激光准直仪理论根据，证明在一定范围内激光束平移或角位移并不影响基准线的位置。
A new theoretical basis of novel laser alignment instrument is put forward. It proves that the position of the basic line will not be influenced when the laser beam has translation and angular motion.
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