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

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

????9??18???????????? ????????,?????????????9?????19??????22?,???????????????????????,???????4~8?,???????8~10?,??????????????????????????????????????12?????????????????????4~5????,?6~8??,????????8~9???

8???????1?????,??20~30?,??????????????????40????????,21???????????

????:?

???19???21?????,???????????????????,????????????????????,????;????????????????40~60???????????????,???????????????80~90?????22????????????,????????????????

????:??

??????????,8??????,?????????????????????,????????21????,???????????,??????????,??,?????,??????????????????,????????????

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