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已知,,则向量方向上的投影是(   )

A.- B. C. D.1

D

解析试题分析:由向量方向上的投影的定义得,方向上的投影是||cos< , > =||×2=1,故选D。
考点:本题主要考查向量方向上的投影的定义,向量的夹角计算。
点评:简单题,方向上的投影是||cos< , >=

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