通过物质平衡原理讨论并新建立了计算方坯中心缩孔的数学模型。
The updated mathematic models for calculation of the central pipe formotion in continuous cast billet are built up, based on the material balance and the previous published models.
根据物质平衡原理，设计了一套测量岩石吸附天然气量的实验装置。
A set of experimental unit for measuring absorbability of natural gas in source rocks was built according to the principle of material balance.
本文应用物质平衡原理，研究了抽油井环空拟液面在测试过程中的运动规律。
Based on the principle of mass balance, this paper deals with rules of. motion of the pseudo-fluid level in the annular space in the process of testing the pumping oil well.
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