如圖所示是邏輯電路圖及其真值表,此邏輯電路為                             門電路,在真值表中X處的邏輯值為           .   

輸入           輸出

A                B           Z

0                 0           0

0                 1           l

1                 0           X

1                 1           l

                                                                                                             

                                                                                                                                       

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