Besides, according to the result of the calculating example, a discussion is made about how to determine the mean year of the different observation periods and how to choose the leveling lines.
此外，根据实例计算的结果，讨论了有关中心年代的选取以及观测路线的取舍等问题。
Besides, according to the result of the calculating example, a discussion is made about how to determine the mean year of the different observation periods and how to choose the leveling lines.
此外，根据实例计算的结果，讨论了有关中心年代的选取以及观测路线的取舍等问题。
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