给出引力的作用规律和关于物质分布的假设后，下一步是得出宇宙的动力学规律——空间和质量如何与时间相互作用。
Given a law of gravity and an assumption about how the matter is distributed, the next step is to work out the dynamics of the universe - how space and the matter in it evolves with time.
扭转试验在确定材料力学性能、检验材料质量方面被广泛采用。
The experiment of torsion is widely adopted to test the mechanical capability of materials and to check up the quality of materials.
同时研究了不同孕育条件对硼灰铸铁的力学性能及冶金质量指标的影响。
This paper mainly studies the influence of the boron gray cast iron with its microstructure, mechanical properties and metallurgical quality index in different inoculating conditions.
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