??????“?????????” ???

????:???????:????

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

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

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

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