观察下 * * 幅反映建国以来不同时期的经济建设成就的地图。请回答：
（1）图一反映出的经济建设成就有何特点？取得这些成就的条件有哪些？
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| （2）图二与图一相比，经济建设成就有何新特点？在当时的社会条件下，为什么能取得这些成就？ |
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| （3）图三反映出一种怎样的经济建设格局？形成这一格局的主要条件有哪些？ |
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