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??????????????10????31? ?????,??????21??“??”????????????????10???????31??14?????,?15??(48????/???????,?)?????,30??,?8~12??????,???14~17??????;??100~300?????????????,??????????????400~600??,?1000???

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????:31?????????11?????????????????2?????,????????????“????”?,????????????????????????????????????????????????7~9????,???10~11?????;???????????????????????????????????11~12????,??13~14????,?????13~16??,?????????17???????

????:31??11?????????????????1??????????,??????????????,????(???100~200??),???????????????????????(?????250~400???,?????????400~800????????????????????????);???????????????40~70??,????????????80??

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