????????????????..??????????????????.???????????????????.245黑龙江省农作物种植结构的成因分析与对策???????????????????????????????????????????????????????????????????????????????????.????????????????????.???????????????????????????????????????.406结论与讨论????????????????????????????..???????????????????????????????????????.???????????????????????????????????????.40致j射??????????????????????????????????????????..41参考文献?????????????????????。????????.42攻读硕士学位期间发表的学术论文????????????????????46万方数据CONTENTSCoNTENTSAbstractinAbstractin1Introduction??????????????????????????????????????1Backgroundoftheresearch?????????????.???????????????··1Researchobjectiveandsignificance???????....?.?.?....??·....?-···???·?···???????????????????????.???????.5’??????????????.????????.?????????????????????.?????????????????..????????????????????????????.???..—Temporaldistribution?????????????????????????.???????????????????????????.???.????????????????????.???-·??.??????.?.???.???.??????????123Profileswiththedatasourceinthestudyarea??????????.????????.?13Thenaturalconditionsinheilongjiangprovince.????????.????.?..??.????????????.?????????????????··????????????????????????????????·?????????????????????????.???????????...
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