Physics Unit31: Nuclear Energy and Radiation (id: aa5a1f5b1)

本题目来源于试卷: Physics Unit31: Nuclear Energy and Radiation，类别为 通用国际物理

[单选题]
What is necessary tohf2ge)f/fv i9s2tri( u/n dvfvr7/:* v5pymae5,k sq stop beta particles?

A. air alone
B. paper
C. metal foil
D. thick metal


参考答案:  C


本题详细解析: 暂无

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