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German submarine U-31 - Wikipedia, the free encyclopedia
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日期:2024-10-04
U-31 may refer to one of the following German submarines: SM U-31 (Germany), was the lead ship of the Type U 31 class of submarines; launched in 1914 and served in the First World War until sunk on 13 January 1915 During the First World War, Germany also ...看更多