Therefore it is considered that the decrement of gravity vertical gradient is caused by mountain mass distribution.
分析了佘山重力垂直梯度偏小的原因，认为这是由于山体质量分布引起的。
By very simple mathematical derivations, the practical expression of (Vzz), the expression of normal vertical gravity gradient, and the comment on the accuracy were given.
本文以极简单的数学推导，给出了正常重力垂直梯度的实用表达式，并对其精度作出了评价。
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