????:1????????92??95:??????

2?????????

3?????vx

4?????

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

???????????????2???????????????????5?????????????? (???????????????????????? ??????????)??5???????

???????

???:????????,??,??????????????????????????????????????,?????????

??,?,????????

????50????,?????,???,?????????,????????????50??????????,?????????????????,??????????,??,??????????,??,?,????????????(????????) ????:????????????????