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【单选题】
以下四个命题正确的是 [ ]A.
．空间的任何一个向量都可用其他三个向量表示
C.
．若{a ，b ，c} 为空间向量的一组基底，则a ，b ，c 全不是零向量 C ．△ABC 为直角三角形的充要条件是 D．任何三个不共线的向量都可构成空间向量的一个基底
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A.
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B.
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C.
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D.
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