????:1??????????:??????????

2????????????

3???????????

4?????????

5?????

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

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

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

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