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| символ радиации (The international radiation symbol (also known as trefoil) first appeared in 1946, at the University of California, Berkeley Radiation Laboratory. wiki (Hazard symbol) Alexander Demidov) | |||
| знак радиационной опасности; символ радиоактивности; символ радиации | |||
| radiation symbol: 4 phrases in 1 subject |
| Nuclear physics | 4 |