In addition, the influence of altitude on corona onset voltage of busbar is also discussed, and altitude correction method used in the project is suggested in this paper.
文中还针对海拔对管母线起晕电压的影响进行了讨论，给出了工程适用的海拔校正方法。
Based on analysing theoretical formula of normal gravity field of the earth, the author holds that the geodetic elevation of GPS survey might ha adopted for cavity altitude correction.
本文通过对地球正常重力场理论公式的分析，认为可以采用GPS测量的大地高进行重力高度改正。
Based on analysing theoretical formula of normal gravity field of the earth, the author holds that the geodetic elevation of GPS survey might ha adopted for cavity altitude correction.
本文通过对地球正常重力场理论公式的分析，认为可以采用GPS测量的大地高进行重力高度改正。
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