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When the coil is energized, the iron core attracts the armature and the support plate to move down, and the contact points are turned on or off instantly. The piston rod and the lever slowly decrease due to the influence of the blocking nylon. After a certain period of time, the piston rod decreases to a certain position, and the delayed action contact is pushed by the lever to act, which is in an open state, while the moving contact is closed. The delay time of the relay is the time when the coil is energized until the delay contact completes its action. When the coil is powered off, the relay is restored by the recovery action of the spring.Source: Uncle Kai tells a story (ID: Kaishujianggushi)In order to prepare a zero-based environment, we will empty the rules provided by default in centos6 so that we can carry out experiments and use the iptables-F INPUT command to empty the rules in the INPUT chain of the filter table. Later, we will summarize the relevant commands for clearing the rules separately, and there is no need to struggle with this command here.洪恩三只小猪学英语——和三只小猪一起学习简单的英语单词和对话~吕雉已经表示过了，只要韩信肯肯出兵，现在的汉太子，未来也是实际上的汉王刘盈会向齐国称臣。Centos7, The service is no longer started using init-style scripts, Instead, the unit file is used, Therefore, commands like service iptables start can no longer be used in centos7, Therefore, service iptables save cannot be executed. At the same time, firewall is used to replace the original iptables service in centos7, but don't worry, we just need to install iptables and iptables-services through yum source (iptables are usually installed by default, but iptables-services are not installed by default in centos7). After installing iptables-services in centos7, the rules can be saved by the service iptables save command, as in centos6, and the rules are also saved in the/etc/sysconfig/iptables file.Aban gave a very vivid description of Borodine's appearance. In the history of the Chinese revolution, this Soviet Russia consultant played an important role. It can be said that his works are abundant, but most of them are vague. Only Aban made eyewitness descriptions. He also wrote about Gu Weijun's violence and helplessness, Zhang Zongchang's extravagance and cruelty, Song Ziwen's tenacity and competence, Zhang Xueliang's indulgence and fatuity. Among Chinese officials, he paid the most attention to Song Ziwen and had the highest evaluation. He believed that he could be among the world's great men regardless of his political views and personality.