You might ask, well is this an approximate formula?
你们可能会问，这是一个约等式吗。
An approximate formula of voltage loss for application of engineering is given.
给出了便于工程应用的电压损失近似计算公式。
slide-"Example: Newton's famous approximate formula for the gravitational force between two bodies.
幻灯片出现：牛顿著名的万有引力公式。
slide-"Example: Newton's famous approximate formula for the gravitational force between two bodies.
幻灯片出现：牛顿著名的万有引力公式。
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