Which of the following may NOT be included as underwater cultural heritage?

Athe remains of sunken cities.[|]port structures.[|]Shipwrecks.[|]Ship making technologies .

海上丝绸之路

章节列表

I. Ancient Maritime Trade Routes I15 II. Ancient Maritime Trade Routes II16 III. Exchanges on the Silk Road: Products and Technology12 IV. Exchanges on the Silk Road: Religion15 V. Exchange on the Silk Road: Arts13 VI. Underwater Heritage along the Maritime Silk Roads15 VII. Maritime Power Projection18 VIII. The Belt and Road Initiative12 IX. China Shipping Development Outlook 203015