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After in-depth thinking and practical connection, I think:So at the moment, We're on another machine, Use the ping command to send a message to the current machine. As shown in the following figure, the ping command can be responded to, proving that the message sent by the ping command has been normally sent to the host where the firewall is located. The IP address of the machine where the ping command is located is 146, and the IP address of the host currently testing the firewall is 156. We will use this environment to demonstrate the operation of iptables."Sensitivity is also called ISO, which is simply how much light a mobile phone feels when shooting. According to your on-site light, if the on-site light is sufficient, of course, it can be low. If the light is insufficient, it is natural to use high sensitivity. After the high sensitivity comes out, the noise of the photo will be greater. The so-called noise is the kind of noise that you see with a lot of graininess. "1. The product life cycle includes introduction period, growth period, maturity period and recession period.Whether it is large aircraft and micro satellites that have made major breakthroughs in stages or integrated circuits that are about to speed up the assault, they will first strive to solve the "yes" problem. In Li Qiang's view, this is also Shanghai's responsibility to the country.(four) a sound fire safety assessment process control system;1. A copy of the three-certificate business license or a copy of the business license + a copy of the tax registration certificate + an organization code certificate (one copy and stamped with the official seal)