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Advanced system variables; Environmental variables;这是我和铁心兰…………论坛中，类似的帖子和截图多不胜数。这是我的荣幸。Note: Firewall is used by default in centos7. If you want to save the rules with the above command, you need to install iptables-services. Please review the above for the specific configuration process.The real name of this factory is: Hangzhou Green Energy Environmental Protection Power Generation Co., Ltd. Waste Incineration Power Plant (Zihongling, Shaner Village, Puyan Town), Wearing the cloak of environmental protection, it is harmful to one side. As we all know, garbage incineration will release highly toxic dioxin, heavy metal dust and PM2.5, which will directly enter the human body through our breathing, while the other part will fall to the soil, be absorbed by vegetables and other plants and finally enter our body. Dioxin is very toxic, 900 times as much as arsenic. It is called "the poison of the century" and also has reproductive toxicity and genotoxicity. The International Cancer Research Center has listed it as a first-class carcinogen for human beings.See? It's in town.(未完待续……) show_style();。