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【单选题】
电磁波传播的重要特性之一是，在两种介质交界面处电磁场满足边界条件，其具体表达式为？A.
E 1t = E 2t , B 1t = H 2t ; H 1n = H 2n , D 1n = D 2n ；
B.
E 1t = E 2t , H 1t = H 2t ; B 1n = B 2n , D 1n = D 2n ；
C.
E 1t = E 2t , D 1t = D 2t ; B 1n = B 2n , H 1n = H 2n ；
D.
D 1t = D 2t , H 1t = H 2t ; B 1n = B 2n , E 1n = E 2n 。
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