已知,,則向量方向上的投影是(   )

A.- B. C. D.1

D

解析試題分析:由向量方向上的投影的定義得,方向上的投影是||cos< , > =||×2=1,故選D。
考點:本題主要考查向量方向上的投影的定義,向量的夾角計算。
點評:簡單題,方向上的投影是||cos< , >=。

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