A.+20 B.-20 C.+200 D.-200
A.壓電效應(yīng) B.壓磁效應(yīng) C.霍爾效應(yīng) D.電渦流效應(yīng)
A.應(yīng)變效應(yīng) B.電渦流效應(yīng) C.壓電效應(yīng) D.逆壓電效應(yīng)