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3. Abstract Factory ModelIf the command in the above example does not use-s to specify the original source address in the corresponding rule, After the modification is completed, The source address in the rule you modify will automatically change to 0.0. 0.0/0 (this IP represents an IP address that matches all network segments), At this time, the corresponding action of-j is REJECT, Therefore, if the original source address of the rule is not specified when executing the above command, all IP requests will be rejected (because the original source address is not specified, the source address of the current rule will automatically change to 0.0. 0.0/0). If you are using ssh to remotely go to the server for iptables setting, your ssh request will also be blocked.A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, Between that valve stem 3 and the valve cov 2 there is provided a packing assembly 9, The O-ring 10 is further arranged at the upper part of the packing assembly 9, the upper part of the O-ring 10 is provided with a packing gland 11, the valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41, the packing assembly 9 comprises a flexible graphite packing layer, and the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity.地球变暖引发的罕见的飓风席卷全球，随之而来的便是惊天大海啸和特大冰雹灾害：艾菲尔铁塔摇摇欲坠，埃及大金字塔土崩瓦解，纽约自然博物馆被浓雾吞噬，美国白宫瞬间崩塌，死伤无数，整个地球瞬间变为人间炼狱科学家罗斯教授组织发起了一支风暴敢死队，他们用生命去争取人类的最后一线生机。而此时恐怖分子的袭击让整个局面更加混乱不堪。就在此时，飓风突然以不可挡之势迅速上升为历史上罕见的特大风暴，难道这真的是世界末日了吗？敢死队将如何拯救地球，人类将如何幸存……古代，鲲鹏国王侍卫愚公性情耿直刚烈，得罪了大臣智叟。愚公遭陷害，全家被贬回故乡。愚公面对家门前的太行和王屋两座大山，苦于祖辈饱受封闭、贫穷之苦，动员和带领全家想挖平险峻的大山，造福子孙后代。山中的妖魔做法，使愚公长子不幸丧命，三子负伤致残，这些都没有动摇愚公的雄心。最终愚公的执着影响了村民，也感动了玉皇大帝，命令两个大力神将一山背到朔方东部，将一山背到雍州南部，以保三界和谐。愚公了却心愿，安详而逝。村民怀念他的功德，为他举行了盛大的葬礼。从此，愚公壮举名扬千古，愚公精神流芳百世。卡尔库鲁斯教授遭到印加人绑架，丁丁和船长一直追踪来到南美洲。在这里，印加王的威严使他们一无所获，因为人人都害怕印加王。丁丁勇敢地帮助印加小孩佐里诺，使跟踪他们的印加人对他改变了看法，同时丁丁也获得了佐里诺的帮助。他们误闯入印加王的神庙成为了太阳神的囚徒，而等待他们的惩罚是被太阳活活烧死。最后，聪明的丁丁利用日食现象摆脱了困境，拯救了教授和受苦的科学家。