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Structural patterns, as the name implies, discuss the structure of classes and objects and are mainly used to deal with the combination of classes or objects. It includes two types, one is class structure pattern, which refers to the combination of interfaces or implementations by inheritance mechanism. The second is the object structure mode, which refers to the realization of new functions by combining objects. It includes adapter mode, bridge mode, decorator mode, combination mode, appearance mode, element mode and agent mode.(1) The utility model provides a low-temperature stop valve, wherein a guide sleeve is added at the valve disc, and is fixed by bolts and elastic pads, so as to position and guide the seal of the valve; ;[Doctors involved in "Tucao Hongmao Medicated Liquor" are expected to obtain a guarantor today pending trial. Lawyers are rushing to Liangcheng to go through the formalities]Chapter II Driving and Navigation Rules2572我问了他，他不肯说，只说要见老公爷。