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【单选题】
已知 a , b , e 是平面向量, e 是单位向量.若非零向量 a 与 e 的夹角为 ,向量 b 满足 b 2 − 4 e · b +3=0 ,则 | a − b | 的最小值是( )A.
− 1
B.
1
C.
2
D.
3
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A.
正确
B.
错误
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