短語詞組短語bimodal MWD polyethylene 雙峰分子量分佈聚乙烯bimodal polyethylene resin 雙峰聚乙烯樹脂bimodal high density polyethylene 雙峰高密度聚乙烯bimodal medium density polyethylene 雙峰中密度聚乙烯linear bimodal polyethylene 線性雙峰聚乙烯bimodal relative molecular mass polyethylene 雙峰相對分子質(zhì)量分佈聚乙烯 返回 bimodal polyethylene