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

2??????

3????????

4????????

5??????????

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

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

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

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