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

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

??????????????????,“????????????”???????????????????????????????,???????????????????????????????,??????,????????20????????????(??)????????0.3%/???????,20???0.5%/???????????????????????????????????????????????????????????????????????????

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

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