????:1??????????:?????98??

2??????

3???????????

4??????????

5???????

???????????2?17? (??????????? ????????????)???????17?????,?,2???????????13??????????16?,????????????????????,???72????????????????15.3?,???;????????????????????????????10?48?????????????6.5?~10.9????,??;??????????????????????4???

?????????????????,????? ??

?,??,???????????????????

?????????2?18????2????22?????????????,???????,???????????????,????2???????????19??????????2??20????????,?????????,??????????????????,??????,???,???????(???)

???:????