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如图,在Rt△ABC中,∠ACB为90°,CD⊥AB,cos∠BCD=,BD=1...
如图,在Rt△ABC中,∠ACB为90°,CD⊥AB,cos∠BCD=
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,BD=1,则边AB的长是( )
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A.
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B.
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C.2
D.
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