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平面坐标系
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平面坐标系
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horizontal coordinate system
平面坐标系
在同一个平面上有公共原点的两条数轴所构成的坐标系。分为平面直角坐标系和平面极坐标系。
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Yunnan Daily Press Group
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Yunnan Lijiashan Bronze Museum
Yunnan Military Academy History Museum
Yunnan Minority Film Studio
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Yunnan Nationalities Museum
Yunnan Observatories
Yunnan opera
Yunnan opera school
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