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

2??????????

3?????vx

4?????????

5??????????

??????????1??8?????????

????:????????????,??,????,????“???????????+????????????????????”“??????????+????”???????????????????????“??????”???????????????????

?????????:?????,?????????????:?????????????????????10??????,??5000??,???????????,???????????,??????????,????????????????,“??????????????????????????????”??????????

???“???”??,??????????????????“???????????????”???????????????????,????15????,???????????,???????????????????????????????????????,????????????????????,????????,??????????(?????????????? ?)

?????:????