2021??8??10???????????????????, ????????й?????????Oil Country Tubular Goods?????????????????????????й????永????????????????????????????????????????????й??????????????????????????????????й??永???????????????????????????????????????????????????????????????????????????????????????????永??????99.14%????????????????27.08%?????????????

2009??5??5??????????????????棬????????й??????????з???????????????????顣2009??11??24??????????й??永???????????????á?2010??4??9??????????й??永???????????????á?2014??12??1???????????????й????????????????????????????????臨?????????顣2015??4??10???????????????????????????????????臨????á?2020??4??1???????????????й????????????????????????????????臨?????????顣2020??6??29???????????????й??????????????????????ο??????臨????á?2020??7??29??????????????????棬????????й??????????????????????ο??????臨????á?2020??11??12??????????????????棬????????й???????????????????????????顣????永?????????????????????????????????????????????й???????????????????????

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https://www.federalregister.gov/documents/2021/08/10/2021-17016/oil-country-tubular-goods-from-the-peoples-republic-of-china-preliminary-affirmative-determinations