38. Which of the following expressions is a static electric field
(A)
=(2xy,-2yz,-y2)
(B)
=(2z,-2yz,-x2)
(C)
=(2x,-2yz,-y2)
(D)
=(yz,yz,yz)
(E)
=(2xy-3,2x2,0)
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統計: A(0), B(1), C(6), D(1), E(0) #3224684
統計: A(0), B(1), C(6), D(1), E(0) #3224684