2020??2??4???????????ó??????USITC????????????й???????????Refined Brown Aluminum Oxide???????????η????????臨??????????????????????????з??????????????????????????永?????????????????????????????????????????????????????y???????????з??????????????Ч???????t??У?5??????????ó?????????????????

2002??11??20???????????????й?????????????з????????????顣2003??9??26???????????????????й????????????????????????????á?2008??10??1???????????????????й?????????????е???η????????臨?????????顣2009??1??23??????????????????棬????????й???????????????????η????????臨????á?2014??2??3???????????????????й?????????????е???η????????臨?????????顣2014??9??18??????????????????棬????????й???????????????????η????????臨????????á?

2019??9??10??????????????????棬????????й???????????????????η????????臨?????????顣2019??12??31?????????????????????????????й????????????????????η????????????臨????á?

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????https://www.usitc.gov/press_room/news_release/2020/er0204ll1286.htm