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下列命题正确的是( ) A.若•=•,则= B.若|+|=|-|,则•=0 C....
下列命题正确的是( )
A.若
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•
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=
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•
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,则
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=
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B.若|
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+
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|=|
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-
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|,则
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•
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=0
C.若
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∥
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,
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∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278289559/SYS201311012249102782895008_ST/15.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278289559/SYS201311012249102782895008_ST/16.png)
∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278289559/SYS201311012249102782895008_ST/17.png)
D.若
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与
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是单位向量,则
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•
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=1
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,若
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