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

2????????

3???????????

4?????

5?????????

??8??????????????3???????? (?? ???????????? ???????????? ?????????????)????????????3????,??,?????,??????,??????????????????

8??????3???3??30??????,?1??2?,??,???

???(????????)

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

?????????????(?????)

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

??????????????????????,??????,???318??????????????????????,??S434?????????????

?????,?????????????????(?????????????)

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