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【单选题】
已知点A(20,0,0)和点B(20,0,10),关于点A和点B的相对位置,哪一种判断是正确的A.
点A在点B前面
B.
点B在点A前面
C.
点B在点A上方，且重影于W面上
D.
点A在点B下方，且重影在OX轴上
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