Physics Unit30: Nuclear Physics and Radioactivity (id: 41b241da3)

本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity，类别为 通用国际物理

[单选题]
An atom's mass number is detet*fi:2 e,qzo brmined by the numbyt 8u1bhc//pq:w+q fxer of

A. neutrons in its nucleus.
B. nucleons in its nucleus.
C. protons in its nucleus.
D. alpha particles in its nucleus.


参考答案:  B


本题详细解析: 暂无

微信扫一扫，分享更方便