题文
已知
均为单位向量,它们的夹角为60°,那么

=( )A.

B.

C.

D.4 题型:未知 难度:其他题型
答案
C解析
该题暂无解析
考点
据考高分专家说,试题“已知均为单位.....”主要考查你对 [向量模的计算 ]考点的理解。
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