我们倾向于认为人们选择金属材料、陶瓷材料、纤维材料是根据它们在特定用途的条件下的物理性质，如机械性表现。
We tend to think that societies choose materials-metals, ceramics, fibers - according to their physical qualities such as mechanical performance, under a given set of conditions of use.
研究了废弃印刷线路板的主要成分在机械处理过程中的物理性质的变化。
The variety of physical properties of PCBs during mechanical treatment has been studied.
给出了上述材料常温及高温时的光学、物理化学及机械性质。
Optical, physical, chemical, and mechanical properties of above materials at room and high temperature are presented.
在材料选择时必须考虑材料的物理性质和机械性能。
The physical property and mechanical performance must be considered when selecting the valve material.
接枝共聚是一种有效的化学修饰方法，经过接枝改性后，高分子化合物的物理、机械和化学性质都能得到改善。
Graft copolymerization is a effective method for chemical modification. After graft copolymerization, the physical and chemical properties of macromolecules can be improved.
接枝共聚是一种有效的化学修饰方法，经过接枝改性后，高分子化合物的物理、机械和化学性质都能得到改善。
Graft copolymerization is a effective method for chemical modification. After graft copolymerization, the physical and chemical properties of macromolecules can be improved.
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