?? ??????????????????
????:1??????????:??????
2?????????
3??????
4???????????
5???????m
????????8??????????7?? ??,??????????8??7?????6??????:
??????????8?????7?????????????8?????8?????8????,?????????????????????????????????????????????????????20???????,?,??????????????????50??????????????,??????80?;???????????????????????????????????8-10???
????:
1.???????????????????????????????,??????????;
2.??????????????,?????;
3.??????????,??????????????????;
4.???,?????,??????????????????????;
5.????????????,????????????????????????????????????
?????:??????