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。

youdao

The rainfall Intensity Duration Frequency formula is one of the bases in hydrology calculation, and has been of considerable interest to engineers and hydrologists.

降雨公式是水文计算的基本依据之一，也是工程师和水文学家十分关心的问题。

youdao

The duration magnitude formula is fitted for Mu Chengjian colliery.

拟合了适用于木城涧矿区的持续时间震级公式。

youdao