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potassium-argon
| dating
| potassium-argon | |
| chem. | 钾—氩 |
| dating | |
| desert. | 断代; 年代测定 |
| fin. | 期日; 约期 |
| interntl.trade. | 日期 |
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| 钾—氩 | |||
| 钾-氩法 | |||
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potassium-argon dating : 13 phrases in 3 subjects |
| Desert science | 4 |
| Oil / petroleum | 1 |
| Technology | 8 |
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