作者NCUEKLKL (鸟实验室~硍)
看板Chemistry
标题请问一题化学
时间Sun Feb 12 22:58:23 2006
Positron production reslts in
1 higher proton/neutron ratio
2 smaller proton/neutron ratio
3 same proton/neutron ratio
4 smaller neutron/proton ratio
谢谢告位
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1F：→ yiso:变小 举个例子应该就会知道吧 02/12 23:12