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dolinhngoc123
2 năm trước
Đốt cháy khí metan, tỉ lệ thể tích metan và khí oxi lần lượt nào dưới đây gây hỗn hợp nổ ? * A. 3 : 2. B. 1 : 3 . C. 2 :1. D. 1 : 2 .
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