2020??2??13???????????Arkema Inc.??2020??1??23??????????????????????????????й?????????饗Difluoromethane?????????????????顣?????漰????Э????????2903.39.2035???2????????????ó??????USITC????????????2020??3??9??????????????????á???????????ó?????????永???????????????????????????????????????????в????????????????????????е??鰱?????2020??7??1???????????????á?

??????????2018?????????й?????????????????????2150???????

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????https://enforcement.trade.gov/download/factsheets/factsheet-prc-difluoromethane-ad-initiation-021320.pdf