Is the output status of the sequential circuit such as flip-flops, registers, counters, and one-shot multivibrators determined after the power is turned on?
触发器、寄存器、计数器和单单触发多谐振荡器上电后的输出状态不确定。（其可能高，也可能低。）
通常，通过临时重置CLEAR引脚或其它引脚，初步设置上电后的逻辑状态。这称为上电复位。由电阻和晶体管组成的上电复位电路或专为复位信号设计的IC执行上电复位。
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