First, the basic knowledge of physical layer in LTE system was briefly introduced, such as frame structure, downlink slot structure, physical resource distribution, etc.
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What educational research should do is to construct and perfect the system of concept, frame of analyzing and model structure such as "type of ideal".
教育研究要构建和完善那种类似于理念型的概念体系、分析框架和模型化结构，这样才能使教育理论具有较强的解释力。
Portal rigid frame structure has some characteristics, such as light weight, high strength, easily installation, etc. and it is widely used in factory projects.
门式刚架结构由于具有重量轻、强度高、便于安装等特点，近年来在厂房工程中得到了非常广泛的应用。
The specially shaped column frame structure system is used widely for its merits, such as the none prominent angularities indoors so that the usable area can be enlarged.
异形柱框架结构具有室内无突出棱角、增加使用面积等优点，当配合轻质墙体材料使用时，还可节约耕地、减轻建筑物自重。
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