题文
己知
是夹角为60°的两个单位向量,

,若

,则m为( )
A、2
B、-2
C、1
D、-1 题型:未知 难度:其他题型
答案
D解析
该题暂无解析
考点
据考高分专家说,试题“己知是夹角为.....”主要考查你对 [向量数量积的运算 ]考点的理解。
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