(本小题满分12分) 如图,已知点 B 在以 AC 为直径的圆上, SA ⊥面 ABC , AE ⊥ SB 于 E , AF ⊥ SC 于 F . (I)证明: SC ⊥ EF ; (II)若 求三棱锥 S — AEF 的体积.
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