????12????????????2????? (? ????????????????? ?)????????????????12?????2???????????????

?:????,???5??????????,?????,“??????????”???,??,??????“????”????????????????

?:?????????????1000????????????????????,????????????210?????????????????????,?????????????????1520???????????????3.7???,68???,???????????????“??”?????????“?”?

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

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

????:1??????????:????vx

2?????

3???????

4???????498??

5???????

????12????????????2????? (? ????????????????? ?)????????????????12?????2???????????????

?:????,???5??????????,?????,“??????????”???,??,??????“????”????????????????

?:?????????????1000????????????????????,????????????210?????????????????????,?????????????????1520???????????????3.7???,68???,???????????????“??”?????????“?”?

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