题目内容

点M(2,−3,1)关于坐标原点o及平面xoy的对称点分别是

A. (−2,3,−1)及(2,3,1)
B. (−2,3,−1)及(2,−3,−1)
C. (2,−3,−1)及(−2,−3,−1)
D. (−2,−3,−1)及(2,−3,−1)

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