??????“???” ?????????

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

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

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

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