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

2?????????

3?????vx

4???????

5????????

????????????????????6?????????????29?(??????? ???????????????????)29?????????????????,????????,???????????,??510??

?? ??????????? ??? ?

?????????????,6?26??????????????????????,??,??,??,??????????200???,???,?????????

???? ?

???,??,?????????????6??????????????????28???20????????????????????????????????,???????510???????????????????66?,??????????????????????29???????????????

??????,???????????,???????????6?????????????????15?????????????,??????????????????(?????????????)

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