The output of an AND gate with inputs A, B, and C is a 1(HIGH) when

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  A．It goes LOW at t=0 and back HIGH at t=3ms.该脉冲在t=0ms降为低电平，t=3ms时返回高电平 B．It goes LOW at t=0.8ms and back HIGH at t=3ms.该脉冲在t=0.8ms降为低电平，t=3ms时返回高电平 C．It goes LOW at t=0.8ms and back HIGH at t=1ms.该脉冲在t=0.8ms降为低电平，t=1ms时返回高电平 D．It goes HIGH at t=0.8ms and back LOW at t=1ms.该脉冲在t=0.8ms升为高电平，t=1ms时返回低电平

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