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　Time relay, English name is me relay, is a relay that generates action only after the input action signal is added or removed, and the output circuit needs a specified accurate time. It is applied to low circuits to switch on or off high voltage and high current circuits. Time relay is also an electrical appliance that uses electromagnetic principle or principle to realize delay control, including air damping type, electric type, electronic type and other types.When Liu Guiduo saw the raft drifting away, he was so angry that he cursed, 'I, come back!' Like crazy. The raft drifted away, slowly only the size of a fist.一时间，大河两岸战争一触即发。As shown in the above figure, when ping 156 host, the PING command has not been responded to. It seems that our iptables rule has come into effect. The message sent by ping has not been accepted by 156 host at all, but has been discarded, so let alone any response. Well, we have successfully configured an iptables rule. It seems that we have already started.