???????????????

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

?????????????????????6????????16? ?,??6????16??????18?????????????????:???17????,????????????????????????????????????????????????????????????35~36???,????,????????????????????????????????????????37~39?,???????40???????????????????????????????????????

?????????18?????,???????????????????????37~39???,????????40???????

??:

1.?????;

2.???;

3.?????????????????????????????;

4.????? ???:??