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SN74LS374DW锁存器不能锁存数据问题

如下图所示,当U6B的3端口拉低电平,CLK上升,D1-D5的数据不能被反映至Q1-Q5处;

同样,U6C的5端口拉低电平,CLK上升,D1-D5的数据不能被反映至Q1-Q5处;

请问如何解决锁存器不能锁存问题。