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background radioactivity | |||
background activity |
本底放 射 性 : 16 phrases in 11 subjects |
Chemistry | 1 |
Desert science | 1 |
Earth sciences | 2 |
Electronics | 2 |
General | 1 |
Geophysics | 1 |
Metallurgy | 1 |
Nuclear physics | 1 |
Oil / petroleum | 2 |
Sports | 1 |
Technology | 3 |