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15.已知π+介子、π—介子都是由一个夸克(夸克u或夸克d)和一个反夸克(反夸克 或反夸克 )组成的,它们的带电量如下表所示,表中e为元电荷。π+π—ud带电量+e-e+下列说法正确的是 ( ) A.
問題詳情
15.已知π+介子、π—介子都是由一个夸克(夸克u或夸克d)和一个反夸克(反夸克
或反夸克
)组成的,它们的带电量如下表所示,表中e为元电荷。π+π—ud带电量+e-e+下列说法正确的是 ( )
A.π+由u和
组成B.π+由d和
组成C.π—由u和
组成D.π—由d和
组成
參考答案
答案:A,D
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0) #
個人:尚未作答 書單:沒有書單,新增
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