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![[เคมีม.4]ธาตุกัมมันตรังสี Sampul](https://d1e9oo257tadp1.cloudfront.net/uploads/content/cover_file/779366/thumb_m_3196531d59.jpg?Expires=1717518720&Signature=q6riU4pg47U0Nn~0TNq3p2qwgZVxJBvPDdalhoUat8XgCRP-XB4xB4TqtFNw9Ym3bl-0qQq6sGT0L7rI-Nb7wgnmbjWvZ6Fge~O~JlwNYPrJj1ikGLYhbTNpjXRnsE2x6h6TsBnhMJXL1zc40YaMLd0KB~xKdU7CCNESScXEFNwKUYXH9QteBO9KXcj0R1JfU1ADiK9qwRLejFxWBtntb6BwzZi4fLmDHBdop6QRn4lFBiCZKzaTEVgle7-Z2gXn8-V3XNrxZJcPg198b0s5IcNDL2K-KKODqMkd4jlJHGy7vGteiKr3nSF6IvUr6sKlEHFyTg7NmZCeYF4ldvR1FA__&Key-Pair-Id=K2W722D70GJS8W)