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?? ?? ????? ??? ?????, ???????? ???? ????? ??????? ???? ???? ?????? ?????? ?? WCH-1, WCH-2, WCH-3, WCH-4. WCH-1 ?????? ???? ??????, ????? ??? ???? ?? ???? ??????? ?????, WCH-2 ????? ?? ????? ??? ????? ?? ???? ????? ??????? ?????, WCH-3 ????? ????? YG ????? ???? ????? ???????, WCH-4 ????? ????? ????? YT ????? ???? ????? ??????? - -.

???? ??????? ????? ?????? ???? ????? ????? ?? ???, ???? ???????, ??????? ?? ??? ?????? ?????; ?????? ??????, ??? ???? ???? ?????? ??????? ????? ??????, ?????? ?????? ???? ?? ??????? ?? ?????; ???????? ?????? ????, ??????? ??? ????? ??????? ??? ????? ????? ????????? ?? ???? ????? ??????.

????? ???? "Reproduced ??????? ????? ???? (GB / T 26055-2010)" ???: i.chinatungsten.com

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