首页 / 百科 / 内容详情 Additives are external substances purposely added to change properties of polymers or resins. 2022-04-21 5次阅读 substances properties Additives Additives are external substances purposely added to change properties of polymers or resins. A.正确B.错误正确答案：正确 Polyethylene pipes can be processed by . Most polymers are flammable in their pure form, except（）. 猜你喜欢 Fermentation has already become the method of choice for a wide range of substances. Drugs are administered as pure drug substances alone. There are thousands of medicinal substances currently in use, just including plants and animal substances.