单项选择题
A.clock=0B.enable=0C.reset=0D.enable=1
A.clock =1，enable =下降沿B.clock =上升沿，enable =1C.clock =下降沿，enable =XD.clock =上升沿，enable =0
A.4B.2C.5D.6
A.LE＝0B.LE＝1C.LE=XD.LE=H
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