位于三岛市的中国潜艇基地正在总装一艘新型号潜艇，两月后必须交付海军试航，D国情报机构通过先进的技术手段，证实了中国新型号潜艇采用尖端的多元合金材料，使噪声低于海洋背景噪声，极大提高了潜艇的威慑力。D国...
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