Physics Unit32: Elementary Particles (id: 69ec7b2a6)

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本题目来源于试卷: Physics Unit32: Elementary Particles，类别为 Generic Physics

[单选题]
A particle that travqu-,iy p73o axgw;db3r: tid( els at thel rvu733 r hafx4k k,d(9sxo4q speed of 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