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相对原子质量 (原子量 ) :Ｈ— 1 Ｃ— 12 Ｏ— 16 Ｎａ— 2 3 Ｓ— 32 Ｆｅ— 5 6 Ｃｕ— 6 4六、单项选择题 (共 12分 )2 9.下列变化中 ,属于物理变化的是 ( )………………Ａ .家庭自制冰块 Ｂ .牛奶变酸Ｃ .糯米酿造酒粮 Ｄ .火柴燃烧30 .美国和日本的三位科
Relative atomic mass (atomic weight): H - 1 C - 12 O - 16 Na - 2 3 S - 32 Fe - 5 6 Cu - 6 4 Six, single-choice questions (12 points in total) 2 9. In the following changes, belonging to the physical The changes are () ..................... A. Home-made ice cubes B. Milk sour C. glutinous rice brewing wine D. Match burning 30. The United States and Japan three subjects