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【单选题】
一向量的终点在点B(2,-1,7)，它在x轴、y轴、z轴上的投影依次为3，-2和9，则这向量的起点A的坐标为（ ）A.
(0,-2,1)
B.
(3,-1,1)
C.
(-1,1,-2)
D.
(4,-4,7)
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举一反三
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A.
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