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【单选题】
所谓压电效应是指某些电介质在受到某一方向的外力作用而发生形变(包括弯曲和伸缩形变)时,由于内部电荷的极化现象,会在其表面产生 ( ) 的现象。
A.
电流
B.
磁场
C.
电荷
D.
磁阻
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