读图回答下列问题。(12分)

⑴ 简述图示河流最小流量出现的时间及其原因。(4分)
                                                                 
                                                                 
⑵ 说出甲基地最主要的商品性农作物,分析该基地形成与发展的优势条件(5分)
农作物            、                                                                                                                                
                                                                 
                                                                 
⑶ 近年来外资企业纷纷落户天津、青岛、大连,其共同的区位优势有哪些?(3分)
                                                                 
                                                                 
                                                                 

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