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。
2
In addition, there are elevation correction, stone slab correction and normal correction programs.
此外还备有高度改正，中间层改正和正常改正程序。
3
Circulating immune complex (CIC) elevated cases in CFU-F reduced group were not more common than that in CFU-F normal group. Thus the elevation of CIC was not related to micro-environment defect.