题文
已知
,则

等于( )A.7
B.

C.

D.

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“已知,则等于.....”主要考查你对 [向量模的计算 ]考点的理解。
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