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Let's understand such a problem first, If our front-end development needs are the needs given to us by the demand side, It is possible that a front-end developer will deal with multiple demanders, Therefore, it will keep in touch with multiple demand parties. Then in the program it means keeping references to multiple objects, The larger the program, There will be more and more objects, The relationship between them will become more and more complicated. Now if there is an intermediary (if it is our supervisor) to meet the needs of multiple demanders, Then the demander only needs to give all the requirements to our supervisor, who will assign tasks to us according to our workload in turn. In this way, our front-end development does not need to contact with multiple business parties, we only need to contact our supervisor (i.e. Intermediary), which weakens the coupling between objects.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.　　Sam是否能秉持自己的人性不步入黑暗面呢？兄弟两人这一次能否战胜恶魔？从不发传-销、诈-骗、色-情等广告的他，已经对得起国家，对得起人民了，已经是少有的高素质水军了。根据小池真理子原作改编，由铃木京香主演。孤独寡妇和精神科医生谱黄昏之恋却不知对方有不为人知的生活及谜团。A. Import a picture map, place it parallel to the surface to be mapped, then explode, absorb the picture material, and fill it on the curved surface.我想等下一批，往云州去。