??
???2?17?? (????????????????? ?)?17??,??????,2???13?????16???,???????????????????????,???????????72????????15.3?,??;???????????????10??48???????6.5?~10.9?????????,???;???????????4???
?,?,?????????????????????????????
?????????????2????????????????????18??2?22???????????,?,??????????????,???2??????????????????19??2??20?????????,?,?????????,?????????????????????????,????????????,????(???)
????????????:??????????????????????????
???????????? ???????????15.3??????????????