common logarithm

the value Δ t of reservoir displayed by sp curves is read from top to bottom; and the dispersing or distributing points of formation depth ( h) versus its corresponding value Δ t are plotted with the depth h as abscissa and common logarithm as ordinate.

利用声波时差，结合自然电位，在储集层段自上而下读取声波时差值（Δt），并以地层深度（H）为横坐标，以对数为纵坐标，作散点图；

Calculation of sinking displacement missing in measuring with common logarithm function

用常用对数函数计算罗子山水库大坝漏测沉陷量

Now the commonly used seal groove is a logarithm spiral groove.

现在的密封槽型比较常用的是对数螺线槽.

using the slope-ratio technique from regression of common logarithm value of different indexes on mean daily zn intake, relative bioavailability of zn-lys and zn-met were different.

采用斜率比法，不同判据指标得到的赖氨酸螯合锌和蛋氨酸螯合锌的相对生物学效价不同。