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

2???????

3????????

4???????

5?????????

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

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

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

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