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radioactive background | |||
radioactivity background |
放 射 性本底 : 16 phrases in 11 subjects |
Chemistry | 1 |
Earth sciences | 2 |
Electronics | 2 |
General | 1 |
Geophysics | 1 |
Metallurgy | 1 |
Nuclear physics | 1 |
Oil / petroleum | 2 |
Sports | 1 |
Technology | 3 |
Wind Energy | 1 |