The products are widely used in all kinds of fields such as machinery, chemistry, metallurgy, electric power, shipping, space flight, medical application and electronics.

广泛应用于石油、化工、电力、冶金、船舶、航空航天、医药、电子等工业的密封领域。

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A kinetic equation for uniform plasma in the presence of both constant electric and magnetic fields was obtained by the method of micro-density in the phase space.

在有恒定外电、磁场的情况下，采用微观相空间密度方法导出了均匀等离子体的动力学方程。

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By calculating, the article analyzes in detail the spread situation of electric magnetic fields in round space when the point electric charge moves in a low speed, and makes the diagram.

通过计算，详尽分析了点电荷低速运动时，周围空间电磁场分布情况，并给出图示。

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