Physics Unit32: Elementary Particles (id: 47012d6a8)

本题目来源于试卷: Physics Unit32: Elementary Particles，类别为 国际高中通用物理

[单选题]
A particle that travels at thecw7(lit 0jkpe3 l*j4; b kpq5o speed of zmmqy8 k cv+-j bo5.u3toc e/*light

A. has never been observed.
B. must have zero rest mass.
C. must have a very large rest mass.
D. has infinite energy.


参考答案:  B


本题详细解析: 暂无

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