1 下列那一組值會使矩陣 為“歪斜對稱”（skew-symmetric）矩陣？  
(A)a = 1, b = 2, c = 3
(B)a = 1, b = -2, c =- 3
(C)a = -1, b = -2, c = -3
(D)a = -1, b = 2, c = -3

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