$$begin{eqnarray}nablacdotvec{E} &=& frac{rho}{epsilon_0} \nablacdotvec{B} &=& 0 \nablatimesvec{E} &=& -frac{partial B}{partial t} \nablatimesvec{B} &=& mu_0left(vec{J}+epsilon_0frac{partial E}{partial t} right)end{eqnarray}$$ 赞微海报分享
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