??????????????? 5????????

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

?????6??17??,????????????,????6??17????14?18?14???????????,?????????????????????????,?????,?????????????????????????????,???(250~280???????????)???(??20~60?????????????,????80??????),?????????????????????

?:

1?????;

2???,??????????;

3????????????????????????????,??????????????????;

4?????,?????????????????????????????????? ?????:??