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==相關影片==
{{#evu:https://www.youtube.com/watch?v=uwSMhcPlwg4
|alignment=inline
|dimensions=640
|container=frame
|description= Истоки реки Ока (The origins of the Oka River)
}}
{{#evu:https://www.youtube.com/watch?v=P0WNsVzX7e0
|alignment=inline
|dimensions=640
|container=frame
|description= Путешествие по реке Ока с DJI Mavic Pro и Osmo+ / River Oka (Russia) with DJI
}}
{{#evu:https://www.youtube.com/watch?v=yI9AW8YOkRw
|alignment=inline
|dimensions=640
|container=frame
|description= Дорожка на моторе река Ока . Fishing trolling on the river
}}
{{#evu:https://www.youtube.com/watch?v=wcthlbpe2bo
|alignment=inline
|dimensions=640
|container=frame
|description= Река Ока в Муроме / Oka River in Murom
}}
{{clear}}
== 參考文獻 ==
{{reflist}}
[[Category:710 世界史地]]