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

2??????????

3?????????

4???????

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

??2???13? (????????????? ????????????????????)????????13???????,?????????????????????????????????????????,????????????

????????,???????????????,?10%?,??2000???(??????????????)(?????,??????????)???????????1????,?????10???;?????1???,??10???????,????????10??????????,????????100???????????????,????????3??????,?????1000???????????????????

?????????,???,??????,?????????????????????????????????????????????????,????????;??3??,?????50%???;???????????????,???

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