Physics Unit30: Nuclear Physics and Radioactivity (id: b3e34e9fe)

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本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity，类别为 Generic Physics

[单选题]
Alpha rays can penetr 7g)laf;y 7t*atitfj ,lsg t;1wszfp pg dg +68;+)qlqate

A. air only.
B. a piece of paper.
C. several millimeters of aluminum.
D. several centimeters of lead.


参考答案:  B


本题详细解析: 暂无