????:1???spa??:????????

2???????

3?????????

4???50??????

5???????????

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

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

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

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