The mass fraction of n-butene in mixed C4 from catalytic cracking after etherized was approximately 40%.
混合c 4中含有质量分数约为40%的正丁烯，是生产丙烯的优质原料。
Made from etherized regenerated natural cellulose, the hypoallergenic gauze can additionally protect injuries from infection and eliminate the potential for scarring.
因为这种纱布是天然细胞纤维素制造的，因此具有低免疫原性并且能防止因感染引起的损伤等。
Made from etherized regenerated natural cellulose, the hypoallergenic gauze can additionally protect injuries from infection and eliminate the potential for scarring.
因为这种纱布是天然细胞纤维素制造的，因此具有低免疫原性并且能防止因感染引起的损伤等。
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