A design on the window of a building. The curved part XY is an arc of a circle. The rise of the segmental arc is 10cm, it's span is 100cm - DOCUMEN.TV

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A design on the window of a building. The curved part XY is an arc of a circle. The rise of the segmental arc is 10cm, it’s span is 100cm

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Kẻ hai cột cột 1 là từ địa phương miền bắc tương ứng với cột hai là từ toàn dân

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