????:1????????:????????

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????????????,????,????????????,?????????????????,??????????,??(?)

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