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| natural radioactivity | |||
| natural radioactivity Radiation stemming mainly from uranium, present in small amounts in many rocks, soils, building material, etc. | |||
| natuurlijke radioactiviteit: 1 短语, 1 学科 |
| 电子产品 | 1 |
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| natural radioactivity | |||
| natural radioactivity Radiation stemming mainly from uranium, present in small amounts in many rocks, soils, building material, etc. | |||
| natuurlijke radioactiviteit: 1 短语, 1 学科 |
| 电子产品 | 1 |