采场附近煤体划分为弹性区和非弹性区，但非弹性区不具有隔水性能。
The coal body around mining area can be divided into two parts: the elastic area and the non-elastic area, where the latter does not have water-resisting function.
本文用力学-振动光谱研究了硬弹性聚丙烯（HEPP）晶区和非晶区分子链在拉伸时取向的变化。
The orientation behaviour of molecular chains of hard elastic polypropylene(HEPP) film was investigated on the uniaxial stretching by polarized IR Vibration-Mechanical Spectroscopy.
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