?? ???????????6.8????????????????? ???
????:1???????:???????
2?????????
3??????v
4???????
5????????????
?,?????????6.8????,???,???
???????????,?????????,?????????????????50?????????????,????????????,????????????
?????
4???350????,30???????????????2??????????,???
9?40????????????????????????,???????????,????????????????30?????????????????
????????????9????????50???,???????????????
?200???????;??150?????,????????200?????????
(????)
????:??????????????