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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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