2020??3??5???????????ó??????ITC????????????й?????????饗Difluoromethane????????????????????????????????????????????????永?????????????????????????????????????У?5?????????????????????????ó????????й??永??????????????????????????????й??永??????з????????飬??????2020??7??2????????????????á?

2020??2??13???????????Arkema Inc.??2020??1??23??????????????????????????????й?????????鷢?????????????顣?????漰????Э????????2903.39.2035???2??????????????2018?????????й?????????????????????2150???????

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https://www.usitc.gov/press_room/news_release/2020/er0305ll1436.htm