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如图,在矩形ABCD中,P是CD边上一点,PE⊥BD,垂足为E,PF⊥AC,垂足...
如图,在矩形ABCD中,P是CD边上一点,PE⊥BD,垂足为E,PF⊥AC,垂足为F,如果AB=4,AD=3,那么PE+PF等于( )
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A.3
B.4
C.
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D.
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