(本小题满分12分)在正四棱锥V - ABCD中,P,Q分别为棱VB,VD的中点, 点M在边BC上,且BM: BC = 1 : 3,AB =2,VA =" 6." (I )求证CQ∥平面PAN; (II)求证:CQ⊥AP.
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