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

2?????????????

3?????300?3??vx

4???????

5????????

?????????????????10???????????????????????????2?????????? (? ??????????????)??????10??2??????????F3????????????????????,24???????????,????,????????

?F3???????????????? ???????????

??????10???,?,??????“???????”?????????,?,???????????????,?????????,??????????????????????????

???F3??????9??14???,????“?+??”??????????????,????,????????????????????????

?????? ????

?????12???200????????12???????????500??????,???22???????????200?????????????22???500???????????????22??????400?????,???12???200????????12???????500????

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

??????,???????F3?????????,???F1??,??????,???“??”??,???????????????

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

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