Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use.
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The present invention is feed additive containing chitin oligose and its preparation and use.
本发明涉及一种含壳寡糖的饲料添加剂及其制备方法。
This invention relates to a tetramer combined with SARS antigen peptide and its preparation and use.
本发明涉及一种结合了SARS抗原肽的四聚体及其制备和用途。
Catalyst component comprising magnesium, titanium, halogen, and electron donor, its preparation and use.
包括镁，钛，卤素和电子给体的催化剂组分，它的制备和应用。
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