阅读材料,回答下列问题。
2009年9月14日中国第四个航天发射场—海南航天发射场在海南省文昌市开始动工建设。文昌市位于海南省东北部,地处东经108°21′至东经111°03′,北纬19°20′至北纬20°10′之间,东、南、北三面临海。海南航天发射场是中国在低纬度滨海地区建设的首个航天发射场。下图为我国西昌和文昌卫星发射场地理位置分布比较图。
(1)试分析西昌航天发射场的优越条件。
                                                                                                                                                                
                                                                                                                                                                
(2)结合材料二中的信息,说明我国在海南省文昌市选址建设航天发射场的理由。
                                                                                                                                                               
                                                                                                                                                               
(3)试分析我国在海南建设发射场的重要意义。
                                                                                                                                                               
                                                                                                                                                              
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