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nature | |
nature | radioactive isotopes. Almost all of them occur in nature. and all radioactive isotopes They can be conditionally divided into two groups. The first relatively small group should include isotopes. Radioactivity mixed with stable elements
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ผู้ตั้งกระทู้ nature :: วันที่ลงประกาศ 2022-06-22 17:55:39 |
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