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若|丨=2||≠0,=+,且⊥,则向量与的夹角为A.30°B.60°C.120°D.150...
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若|
丨=2|
|≠0,
=
+
,且
⊥
,则向量
与
的夹角为( )
A.30°
B.60°
C.120°
D.150°
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