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设向量满足,则
A.1 B.2 C.4 D.5
设向量满足,,则
A.1
B.2
C.4
D.5
设向量满足,且,,则( )
A 1 B 4 C 2 D 5
设向量满足,且,,则( )A 1 B 4 C 2 D 5