共50条信息
对于四面体\(ABCD\),给出下列四个命题:
\(①\)若\(AB=AC\),\(BD=CD\),则\(BC⊥AD\);\(②\)若\(AB=CD\),\(AC=BD\),则\(BC⊥AD\);
\(③\)若\(AB⊥AC\),\(BD⊥CD\),则\(BC⊥AD\);\(④\)若\(AB⊥CD\),\(AC⊥BD\),则\(BC⊥AD\).
其中为真命题的是\((\) \()\)
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