?? ?????????? ??????5.4?
????:1???150???????:????
2????????
3???????
4???????????
5??????vx
?????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??????(???????????????) ??:??????????????