buingocanh060402 buingocanh060402

08-09-2021
Chemistry

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biết trong không khí chứa chủ yếu là 2 khí N2 và O2 .vậy tại sao các vùng núi cao có nồng độ oxi loãng hơn đồng bằng

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brae071319 brae071319

08-09-2021

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