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在半径为4的⊙0中.AB、CD是两条直径,M是OB的中点.CM的延长线交⊙0于点...
在半径为4的⊙0中.AB、CD是两条直径,M是OB的中点.CM的延长线交⊙0于点E.若DE=
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,(EM>MC).则sin∠EOM的值为( )
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A.
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B.
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C.
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D.
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