Physics Unit31: Nuclear Energy and Radiation (id: d0a04b440)

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本题目来源于试卷: Physics Unit31: Nuclear Energy and Radiation，类别为 Generic Physics

[单选题]
What is necessary toj b5;lh hxk 5e,-a *. )f-fkjmgxhitd0e/,klr f1;9c3hmk3*fsmf u6(ali f 2baqzrr. 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