Physics Unit30: Nuclear Physics and Radioactivity (id: a20c25627)

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]
Alpha rays can penetjs.;p7bwte5aj r2: oqratex*w) r2az9k u -0nsg(d-,yh qh6 gzlce

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

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