文章还对坐标变换过程中的电磁功率不变性原则进行了讨论。
This paper also discusses the principle of the electromagnetic power unchangeableness to some extent.
致密岩石弹性变形过程中的孔隙度不变性原则将给储量计算带来很大的方便。
It is believed that the principle of porosity invariance during process of tight rock elastic deformation will provide a good deal of convenience for OOIP or reserve estimation.
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