simple_mathematical_expression

1.A ratio is a simple mathematical expression of the relationship of one item to another.
比率为一项目与另一项目之间关系的简单算术列式。
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2.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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