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在△ABC中,∠B=,||=3,||=6,设D是AB的中点,O是△ABC所在平面...
在△ABC中,∠B=
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,|
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|=3
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,|
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|=6,设D是AB的中点,O是△ABC所在平面内的一点,且3
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=
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,则|
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|的值是( )
A.
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B.1
C.
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D.2
考点分析:
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