2020??5??29??????????????????棬????????й???????????????Hydrofluorocarbon Blends?????????????????????????й??????????R-421A???????HFC????????????????????????????????????????R?C404A??R-407A??R?C407C??R?C410A??R?C507A?????????з??????????

?????????????????????????????????????????????????????????й???R-421A??????????HFC?????????????????????? ????????????2019??6??18???????????????????????????????????δ??????? ??????????????????????285.73????

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

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https://www.trade.gov/press-release/us-department-commerce-announces-final-circumvention-decision-imports