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

2?????vx

3????????

4???????

5?????????

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

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

?????? ????????????????:???????????,????,???1000????????????

???,??,????????,???????1100??,????40??????????“???????”?????????,???,????,?????????????????,???

?????????????????????,????1013.6??,???(???????????) ???????????????????:????