What is 'p, ∇, B, ∂B/∂t , J+∂D/∂t"

來源: Quarx 於 2014-05-20 08:56:46 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (66 bytes)

sorry I forgot what learned in high school for physics!

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