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(1) There are five kinds of creation modes: factory method mode, abstract factory mode, singleton mode, builder mode and prototype mode.In fact, the scene we described above is not perfect, Because the target address of the message accessed by the client may not be the local machine, but other servers. When the kernel of the local machine supports IP_FORWARD, we can forward the message to other servers. Therefore, at this time, we will mention other "levels" in iptables, that is, other "chains". They are "before routing", "forwarding" and "after routing". Their English names are4、六月雪 7集 窦娥－傅娟 东门笑－谢绍光2018-01-08 13:18 South Korea Asia Today-Zhu Chengzhi ReportersFlowers not only attract pollinators with color and smell, but also quietly guide insects who are too shy to know what to do because they land on flowers for the first time. There will be a white route on the petals of grassland geranium to guide insects into the center of flowers and find nectar. In this process, the wings of insects will be more or less glued with precious pollen of stamens. The flowers of alpine Pulsatilla and strawberry flowers have white petals on the outside and yellow stamens in the middle. This change in color depth will highlight the stamens and allow insects to fly to the middle of the flowers without hesitation.曾经富甲一方的武状元苏灿遭遇陷害痛失一切，后被一乞丐所救，坎坷磨炼中练得绝技，终成一代醉拳宗师。美国家庭主妇