??????????????2?????15??????????? ?????,???15???????????????????,????????????????????6.4?????????????????,??????????

??????????????,???15??4???48????????????,??????-??(????49.92?,??88.28?)?????6.4?,??

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

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

?? ????????????6.4???????????

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

2???????

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

4????????

5?????100???

??????????????2?????15??????????? ?????,???15???????????????????,????????????????????6.4?????????????????,??????????

??????????????,???15??4???48????????????,??????-??(????49.92?,??88.28?)?????6.4?,??

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

????????????,?????????????????????????????,??? ???:??