第七节 乙烯和丙烯（Ethylene and propene） 第八节 烯烃的制备（Preparation of alkenes） ：烯烃的制备。 ：了解制备烯烃的制备方法。
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本发明涉及一种开孔发泡聚烯烃的制备方法。
The invention relates to a preparation method of open-cell foamed polyolefin.
介绍了一种非加氢降烯烃催化剂的制备及应用。
Application and preparation of a non - hydrogenation reducing - olefin catalyst were introduced.
研究了一种非加氢降烯烃催化剂的制备及应用。
Application and preparation of a non-hydrogenation reducing-olefin catalyst were studied.
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