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

2?????

3?????

4???????????

5??????????

??11?????2??? (?????? ?????????)??11???????????2??????,??2??~4?????,??????,??????????????????????????

?,2??????~4???????????(2????20??~5?? 08 ?),????????????,?????????????????????????????????,?????120~220???350??;??????????????????????????????????????????,??60~120???;???????????????????,?????????????30~60???

5??,??????????????????,???????????????

????????,???,??????,??????????????????????????,????????;??,??,?????????,??????????????????????????????????(?????) ?????:???