聚乙烯HDPE5502S盘锦乙烯聚乙烯HDPE5300B中油华北聚乙烯HDPE000S扬子石化聚乙烯HDPETR480M茂名石化聚乙烯HDPE5301B扬子石化聚乙烯HDPE9455F吉林石化聚乙烯HDPE5000S大庆石化聚乙烯HDPE8008兰州石化聚乙烯HDPE5000S扬子石化聚乙烯HDPET60-800中油华东)