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【单选题】
下列说法中正确的是：(1) 关系式【图片】只是对各向同性的电介质才成立；(2) 关系式【图片】普遍成立;(3) 关系式【图片】只是对各向同性的电介质才成立；(4) 关系式【图片】普遍成立。A.
(1)、 (3)。
B.
(1)、 (4)。
C.
(2)、 (3)。
D.
(2)、 (4)。
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