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1·When underbalanced drilling or drilling easy leaky zone by using aeration fluid, the determination of fluid density and downhole fluid column pressure is very important.

利用气体型流体进行欠平衡钻井，或钻易漏地层时，流体密度及井下液柱压力的确定十分重要。

2·It requires a certain degree of fence, a certain density (refers to the vertical column), but also a certain intensity.

它要求护栏有一定的高度，一定的密度(指竖栏)，还要有一定的强度。

3·With an example of eccentric column capacity, a potential function that satisfies the boundary conditions is formed to obtain corresponding electromagnetic field and its energy density.

文章以偏心圆柱电容为例，通过构造一个满足边界条件的势函数，进而得到相应的静电场和电场能量密度。

4·In center column of core, magnetic flux density is reduced by counteraction.

通过磁通在磁芯中柱的相互抵消作用，降低磁芯的磁通密度。

5·Around the main circuit, the magnetic flux density was the strongest around high current conductors, then electrode, upright column and cross arm, and the weakest was around crystallizer.

在主回路中，各区域磁感应强度由强到弱的顺序为导线区域、电极区域、立柱和横臂区域、结晶器区域。