本题目来源于试卷: Physics Unit32: Elementary Particles，类别为 Generic Physics
[单选题]
A particle that travels at the speedvc.pgrnqqf -6g2; pg) of lig,m/f:7jcps41 j md gjoht
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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Post time 2024-1-22 02:15:01