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天津城的变迁 |
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有战友都会有体会。战友情深哪!
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58年修建的海河防潮闸是海河的入海口,防止海水倒灌,如迂洪涝災害,提闸泄洪!
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海门大桥不是闸,是提升式开启桥,走大船时桥面提升(定时),平时桥面走車,小船桥下自由往来!
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