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读“水库大坝及该地区等高线示意图”，完成下列问题： （1）将下面左右两列内容用线接起来： ①修建水库形成 的淹没区 ②可明显改善航运条件 a.大坝东面的区域x ③洪水危害可能 减少的区域 ④泥沙容易淤积的区域 b.大坝西面的区域 （2）建坝主要应考虑大坝_______________（东面、西面）地区的气候与水文等历史资料，建设水电站可利用的水位落差应是图上的_____________（H1、H2、H3），水轮发电机应安放在图上_____________（A或B）位置上为妥。 （3）适宜建大坝的河段位于_________处（用字母表示），理由是_____________________。
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