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

2?????vx

3???????200??

4??????????

5????????

??????????11??????????22? ????????,??22?,?????????5.4???,????“?????????????”?

?????,?22??18????????????45??20??22??20???????40??20?43???????????21???????????????29?????,???20?40?5.4??????????,??23.2?????????????????120.18???????,?????23.2?,????7.7??

?????????????,?,??????????,???????,?“?????????????????????????”???????????,????

?????,??“??”,??“????????????????????”?

?,22??20????40??????????????????4.7??(???) ???:????