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

2?????

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

4?????QT??

5?????vx

??2??13?????? ????13??????,???????????????,??????????????,????????????????????????????????????????6~8???,???10~12?????????????????,?????4~8???,????????10??

??????,?????,???????????????????????????????????????4~5???,?????????4~6?????????????????6~7???

??,?????????????14??15??,???????????????????????????,???????,??????????????;??,???????????????????????????,???

??????,????????,???;????,????????????????,??????????????

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