???“?????????” ??????
???????2?18???????????????? (? ???)??????18????,????????????????,??“?????”,??????????????????,???????“??”?????,??????,??????????????
?“???”???????????????,???????,?????????,???????????50???(??)?,?500??????,??????????1-3??????????????????,???????0.3%-0.5%/?????????????????????????????????????,????????????,???,???????????????,?????????????,?????????
???????????,“???????????????”???????????????????????,????????????,???,????????20??(???)????0.3%/???????,20???????????????0.5%/????????????????????????????????????????
???,?????“????????”?????????????????????20??(??)????????,????????????20????????????,???????????,???????????????????????????????????????????(????????????) ??????????????:????