The data he compiled yielded a mathematical formula for the relationship between a room's echo duration, its quantity and quality of sound-absorbing materials, and its spatial volume.

他收集的数据得出了一个关于房间回声持续时间、吸音材料的数量和质量以及空间体积之间关系的数学公式。

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Therefore, suppose the presupposition of economic batch quantity model not to be completely established, its calculating formula shall be needed to be modified.

因此，经济批量模型假设的前提条件并不完全成立，经济订货批量的计算公式也就需要改进。

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The formula expressed with the quantity of electromagnetic field is presented for calculating transmission information of the conductor.

并给出了以电磁场量表示的导电介质传输信息的计算公式。

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