介绍了用一种简易激光指向器改装经纬仪，使普通经纬仪带有激光指向器。
An improved theodolite fixed with a simple laser direction indicator was introduced.
根据桶形基础的特殊形式，采用普通经纬仪对桶基安装误差进行测量是比较困难的。
Because of the special bucket foundation con structure, it is difficult to measure the bucket foundation installation error by using transit.
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