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1.天然放射现象的发现揭示了( ).A.原子不可再分 B.原子的核式结构C.原子核还可再分 D.原子核由质子和中子组成2.下列说法正确的是( ).A.22688Ra衰变为22286Rn要经过1次α衰变和1次β衰变B.23892U衰变为23491Pa要经过1次α衰变和1次β衰变C.23290Th衰变为20882Pb要经
1. The discovery of natural radiation phenomena reveals (). A. atoms can no longer be divided into B. nuclear structures of atoms C. nucleus can also be subdivided into D. nucleus consists of protons and neutrons 2. The following statement is correct () .A.22688Ra decays to 22286Rn undergoes 1 alpha decay and 1 beta decay. B.23892U decays to 23491 Pa. After 1 alpha decay and 1 beta decay, C.23290Th decays to 20882Pb.