??????????????????????????

     ????? 3??31????????????????????У??μ??????????120???????????????????????????λ?????????6??С?????????????????????3??31??17?????????28.26%????t0.9%??????????????????????????????????????????????????
     ??????????2016???????????????????????????120?????????2547.1????????????????????????????????????????????P2O5???30%?????????t????0.8%??????????????t????????????????????????????????????t???Ч??????? ???????Σ?