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【简答题】
（18分）根据图文（图甲为非洲局部区域图，图乙为图甲中①、②两地的降水量统计图，图丙为坦桑尼亚主要矿产资源分布图），完成下列问题。 过去，矿产只是坦桑尼亚的次要出口货物。近年来，中国投资帮助坦桑尼亚建设基础设施，使达累斯萨拉姆港的吞吐量和陆路交通得到极大改善，同时坦桑尼亚与中国和西方发达国家加强合作使矿业产值每年以20%以上速度发展，成为国民经济和出口的支柱产业。
（1）比较R 1、R 2两河入海口河段水文特征的主要差异。（6分） （2）简述①地与②地的降水差异并分析原因。（6分） （3）简析矿业成为坦桑尼亚国民经济和出口的支柱产业的原因。（6分）
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