2020??9??28?????????????????????????й?????????????[hydrofluorocarbon (HFC) blends]?????????????????????й???????????R-404A??R-407A??R-407C??R-410A??R-507A/R-507??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????CBP????????????й????R-404A??R-407A??R-407C??R-410A??R-507A/R-507?????????????????????????????????????2019??6??18???????δ?????????永?????

2015??7??16???????????????????????й?????????Ｐ??????з????????????飬?永?????????Э?????????3824.78.0000??2903.39.2030??2016??6??22?????????????????????????й?????????Ｐ?????????????????????á?2019??6??18????????HFC?????the American HFC Coalition????????????????????????й????????????????з???????????顣

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https://www.trade.gov/press-release/us-department-commerce-issues-final-ruling-anti-circumvention-inquiry-regarding-0