单项选择题
A.0111B.1011C.1100D.0101
A.01000101.1100B.01001000.1001C.01111000.1100D.01001000.1100
A.单稳态电路B.暂稳态的时间TW由电阻R和电容C决定C.输入为负脉冲触发D.输入为正脉冲触发