The invention discloses a polypropylene material with low density, high rigidity and scratch resistance and a preparation method thereof.
本发明公开了一种低密度、高刚性、耐刮擦的聚丙烯材料及其制备方法。
GPS survey and the method of high density resistance rate are two kinds of the advanced practical techniques in admin...
GPS测量及高密度电阻率法两种先进实用技术，是项目实施的先进手段。
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