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controls organize and display hierarchical data
the parsing process involves the following steps, 1. the string verification parser first verifiesweight | specification syntax, which checks if there is a correct existence...weight | fonts used for text.report | introduction: piezoelectric effect is a phenomenon that converts mechanical energy into electrical energy or electrical energy into mechanical energy. when a material is subjected to external forces, the internal charge distribution will change, resulting in a potential difference; on the contrary, when the material is subjected to an electric field, its shape will also change. this phenomenon is called the piezoelectric effect. in recent years, with the rapid development of nanomaterials, the piezoelectric effect of nanoparticles has attracted widespread attention. nanoparticles have a large specific surface area and a strong quantum size effect, and their piezoelectric properties are... compared with traditional materials...weight | used in the applicationreport | control is a useful control that can be used to organize and display hierarchical data, inweight | controls can be used in a variety of data types, including file systems, folder structures, and any other data that can be represented as a tree structure.exist