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如图,D为△ABC的AB边上的一点,∠DCA=∠B,若AC=cm,AB=3cm,...
如图,D为△ABC的AB边上的一点,∠DCA=∠B,若AC=
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cm,AB=3cm,则AD的长为( )
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A.
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cm
B.
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cm
C.2cm
D.
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cm
考点分析:
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