They also worked out an upward deduction equation in form point height h-2 to conquer difficulties in surveying form points, and increase the efficiency of fores.
为了克服对形点的观测困难，该文又提出了形点高的推定式，便于发挥外业调查的工作效率。
They also worked out an upward deduction equation in form point height h-2 to conquer difficulties in surveying form points, and increase the efficiency of fores.
为了克服对形点的观测困难，该文又提出了形点高的推定式，便于发挥外业调查的工作效率。
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