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?2???18?????????????? (??????????????? ????????????????)????????????????????????????18????????????,?????????????,????????“??”,???????????,????“???”????????????,???,???????

???“??”??????????,???????????????????,???????????,?50????(?????????)???????????,???500?,????????1-3??,??????0.3%-0.5%/???????????,?????????????,?????,??????????????????,?,??????

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??,?????“????????”?????20?(???)??,????????20??,???????,???????????????????????????????????????????????????????????????(???) ??:??????

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