12 令   u(x, y) = x2 − y2 為一實數函數，則下列何者是u(x, y) 之調和共軛（harmonic conjugate）？
(A)  v(x, y) = x2 
(B)  v(x, y) = y2 
(C)v(x, y) = 2xy
(D)v(x, y) = 2x / y

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統計： A(0), B(0), C(2), D(0), E(0) #1031697