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In the example above, the-R option means modifying the specified chain, Using-R INPUT 1 means modifying rule 1 of the INPUT chain, Using-j REJECT means that the action of changing the first rule in the INPUT chain to REJECT. Note: In the above example, the-s option and the corresponding source address cannot be omitted. Even if we have already specified the number corresponding to the rule, when modifying a rule with the-R option, we must specify the original matching condition corresponding to the rule (if there are multiple matching conditions, we need to specify them).3. Return-MASTERDOWN error.不是更容易滑？秦淼道：这要使巧劲儿，不然你把针捏再紧也不管用。天启不是说这部小说会着重写玄铁重剑吗？还有，这个神雕大侠杨过是什么鬼？陈启看到这个帖子。The status switching of file upload is much more complicated than that of file upload. The process of controlling file upload requires two node buttons, the first is used to pause and continue upload, and the second is used to delete files.This knowledge lets you know what is good about the design pattern.Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, we often use office software Office XP, drawing software Photoshop, game software Red Alert and so on.