????:1????????v:???????

2???sn??

3???????100?????

4??????????

5??????

??????,?????“??????????”??????,?????

???,??????500???,????????,???“??????????????????”????,????,??,5?????100??????500???,?????????????12.5???25??????,??,????????,??????????“?”?????,????????“?????????”????,?????????????????????

??????????,?????,?,????,???????????????2????????,??,????5????500????,????????????????7???,???????????,?????(???????????????? ?????????????????? ?? ???? ???????? ???? ??)

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