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

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

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

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

????:????

??

??:???????????,??????????,??????????????