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射锕钍的放射性同位素 Th227 shèà
chem. radioactinium
射锕 shèà
earth.sc. Ra-Ac; radioactinium
射锕社同位素 Th²²⁷ shèà
earth.sc. radioactinium
射 锕
: 13 phrases in 6 subjects
Chemistry1
Earth sciences4
General2
Metallurgy2
Oil / petroleum1
Technology3

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