??????????????????????????????????????????????????????????????????????????????????????????????????????
????????????
?40?????????????????????????????15~30???????????????????????????1~2??10??1???
????????????
1?????????????30????????????10????2000?????????????????????????????????????????????????????2~3??
2??????1??????15?????????????????????????????30?????1~2??
3????????????????????????????????30????1?????????30?????2??30??1???
4?????????????30????10?????????15?????1500?????????????10~20?????1??
