读我国南水北调中线示意图,回答下列各问题。
(1)南水北调中线所经地带包括哪些省(市)?该地带的自然条件(地形条件、气候类型、干湿地区)
    怎样?
                                                                                                                                                              
                                                                                                                                                              
(2)分析中线调水的战略与经济意义。
                                                                                                                                                              
                                                                                                                                                              
                                                                                                                                                             
(3)比较隋运河与今天南水北调方案的修建目的有何不同?
                                                                                                                                                             
                                                                                                                                                             
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