????:1?????300?????:?????????????

2?????qq?

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

4???????

5???????

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

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

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

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