Nima uchun qushlar uzoq vaqt uchganda kam bo’gi’lib qolmaydi?
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o’pka bilan bog’langan havo pufaklarining borligi
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tana haroratining doimiy bo’lishi
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uchish vaqtida gaz almashinuvining intensivligi, o’pkada havo almashinuvi
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energiya va moddalar almashinuvining intensivligi
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A,C
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