有一段演繹推理:“因為對數(shù)函數(shù)是減函數(shù);已知是對數(shù)函數(shù),所以是減函數(shù)”,結(jié)論顯然是錯誤的,這是因為(***)                        
A.大前提錯誤B.小前提錯誤C.推理形式錯誤D.非以上錯誤
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